Hi everyone, newbie here. After looking at alot of tutorials and videos i managed to design my own house but i'm really struggling with the first floor rooms and the roof. I've attached pictures and plans and what i have done so far. If anyone could fine tune it for me or explain to me how i can i would be ever so grateful.

https://drive.google.com/open?id=0B7e1quvRmc2hRjloMmZ1UlRrVDA