solver

It's helpful to have an image (screen capture) showing the issue as often it will be enough to provide a suggestion, and eliminate the need to download and review a plan.
 
Edit>Reset to Defaults
 
Choose Roof Directives in Walls
 
Now only make changes to the settings that you understand. It's helpful to work in 3D so yo see changes as they happen.
 

On the right wall, you have 2 windows in the same space. Delete one and your dimensions work as expected.

Try dragging your ceiling plane over to cover, or use a thin soffit.

No need to paint the trim first.
You could also create a new material with your chosen color and use that material in the wall definition.

It doesn't. Consider all the ways to create 1000 sq ft. 
 
1'x1000' gives you 1000 sq ft, as will a 31' and a few inches square.
 
Once you have joined walls to make a room, you will see a Living Area Label automatically created.
 
 
And ...
 
Welcome
 
It's helpful to know what title (Suite, Pro etc) and version (2018, 2019 etc) you are using. This information is needed to provide the best response.
 
Please don't comment saying you included that info in your post, and please do not make another comment saying what you have, instead, place this info in your Signature so it's always available by clicking on your user name at the top right of the page, click Account Settings, then Signature on the left.
 
Doing so makes it always available, and keeps others from having to hunt for it.
 
And, turn on signature display too.
 

 
 
 
----
 
Many questions have been asked and answered. The Home Designer website is a good place to start your search.
 
Here is a video about searching the forum: https://youtu.be/dDT6wbrrVRM
 
 
Resources for self help:
 
The built in Help System (always a good place to start)
 
Getting Started  
Knowledge Base  
YouTube   Home Designer - Getting Started - Setting Preferences and Defaults

Build, or turn on Auto Rebuild wall framing. Be sure to set the top plate count to 1.

Using the Room Divider wall, create a room shaped like you want the stairs. 
Draw the stairs within this room.
Set the stairs to Winders.
Move the 4 walls and stairs close, but not touching the deck.
 

Watch a video or two and you will see how the program is intended to work, and will be able to answer your own questions.
 
Having an actual foundation gives you dimensions.
 
Here is what I would do.
 
Using the CAD tools, trace the exterior of your foundation. 
Copy that line to a new plan.
Draw walls (they will snap to the CAD lines).
Build the foundation.
Adjust things as required filling in interior walls etc.
 
But first, I would watch that video so you understand the process (big picture).

Made the fascia 36", and the overhang is a separate roof plane.
 
How you model will depend on the details, like what the finishes will be. 

Are you using auto or manual roofs?
 
Roofs build over rooms. If you can build a shed roof over a one room structure, you can use the same technique to have one auto build against an existing wall.
 
Manual roofs -- just draw a roof plane where you want it.

Floor framing is located on the floor below, so to see it, you need to use Reference Display.
 
Here I've changed the Reference Display Layer Set to show only floor joists, and left the default red line color.
 
The Open Below space has no floor joists, while the room to the right does.
 

 
Reference Display is handy for all types of things.
 

I'll guess it's the way your concrete foundation walls are defined. Try moving what I assume is the drywall to the interior wall layer instead of the main layer.

Welcome
 
It's helpful to know what title (Suite, Pro etc) and version (2018, 2019 etc) you are using. This information is needed to provide the best response.
 
Please don't comment saying you included that info in your post, and please do not make another comment saying what you have, instead, place this info in your Signature so it's always available by clicking on your user name at the top right of the page, click Account Settings, then Signature on the left.
 
Doing so makes it always available, and keeps others from having to hunt for it.
 
And, turn on signature display too.
 

 
 
When you ask a question, you are initiating a conversation, so please don't ask and then disappear. Stick around to answer follow-up questions and to interact with those helping. 
 
 
 
----
 
Many questions have been asked and answered. The Home Designer website is a good place to start your search.
 
Here is a video about searching the forum: https://youtu.be/dDT6wbrrVRM
 
 
Resources for self help:
 
The built in Help System (always a good place to start)
 
Getting Started  
Knowledge Base  
YouTube   Home Designer - Getting Started - Setting Preferences and Defaults

See if this helps.
 
 

Use Room Divider walls to define the porch. Place post manually.

Suggest you reference the manufacturer information for your window choice and ask your supplier about sizing -- what if any advantage is there for choosing "standard" sizing.
 
Windows are generally made to order, and not stocked somewhere in specific sizes, unless you are buying off the shelf from a retailer.
 
Probably a better way to do what I show, but this should give you what you need.
 
 
 

Start a new plan. Draw a roof plane. Open it and look at the Baseline settings on the General panel. Experiment with the settings.
 
You can enter pitch as 3 in 12 instead of degrees.

Please keep in mind that the people helping here are all volunteers. It's not our job to solve your problems. 
 
David said: "for pier and beam type foundations, they are laid out manually using the provided tools".
 
To be clear, the program will not automatically build a complete pier and beam foundation. It will build some of it, but you will need to place piers and beams and proper footings manually.
 
Here is another link to some info that may get you started. https://www.homedesignersoftware.com/search/?default_tab=all&q=pier
 

No.
 
For your flat roofs, look for Shapes, then Closed in the library. They are on the Geometric Shapes layer (or something like that). 

What you see is the way the program works. Normally you draw with Angle Snaps on -- at least that's how the people that developed the program think. When you turn Angle Snaps off, the cursor changes to remind you.
 
I always leave Angle Snaps on, and never have a problem.
 
Search Help for "pointer icons" (with the quotes) for more info.

Nothing automatic.

Draw CAD in plan. Place a note.