Just can't get good at building?

@moo, here's a link that has some info on architectural styles and what distinguishes them.

https://99percentinvisible.org/article/style-house-visual-guides-domestic-architectural-designs/

And if you have trouble with sizing rooms, then just make the front wall FIRST (the wall that will be most visible when your lot thumbnail is taken). When you take a picture of the lot, the thumbnail will show you where the front wall will be. If you can make that front wall look like a great house facade, then you can fill in and size your rooms and hallways behind the front wall. That might be easier in the beginning.

Most of all...just enjoy yourself. Be creative and try new things. You can always do an eclectic home with a mix of architectural styles. Just remember that if you want to do a home in a particular set style, you will have to use that style to determine how much symmetry/asymmetry your facade has.