the various software you might find at bestbuy or like for building homes, is fairly weak, compared to a good 3D application. but ya get what ya pay for. the cheap stuff is point and click and not much to it. but the bigger 3D applications can be rather difficult to learn.
best suggestion is getting some grid paper, some markers, and start drawing lines, maybe even a straight edge or like.
say each square is 6" inches or the like.
i simply use "paint" comes with every microsoft windows. you can draw yourself some lines up, and then rotate copy/paste ((make sure transparent is checked under edit menu)) and away you go.
goal is not to get every single detail down to the very 1/16 of an inch. but rather rough things out, ya redo things, and rough it out again, keep on roughing things out till ya get something ya like, then ya go from there if need be to a architect or someone with better skills to draw things up, and double check to see if you are within code's / regulations, etc...
other words do not get lost in the micro scopic little details. focus on the bigger picture, and then once that figured out (room placement, sizes, etc...) then focus on were electrical is ran, plumbing is ran, vents for stove top, furnace, etc...
if you have a "tac board" draw something up on grid paper, and then cut yourself out some shapes for say a bed, dressor, furance, fridge, etc.. and then pin/tac them to the paper on the tac board. tac boards are fairly cheap at most hobby stores, heck walmart may have some.
having things done on computer is not always the best, use what is easier for you to understand and use. vs trying to force yourself to learn.
