Home Buliding and Interior Design

Ok, so we have decided to build a 2 story garage. situation is that we are going to live in the garage while building our house. We need 3 bedrooms, a kitchen, bathroom, living area, w/d hookup..pretty much a decent sized apartment. I am willing to have 2 bedrooms upstairs and one bedroom downstairs. All three upstairs would be perfect though. We want warmth in the winter and cool in the summer. Kitchen size is not important, as long as i can store some food and cook. Is there any cheap way to do this. garage dimensions are another thing…woudl a 30′x40′ garage do. Anyone with any advice please help. If you have done this before that would be excellent. Anyone with “free” floor plans? that would be awesome!!