in your Architectural class what program are they using to teach you kids? i would find ( using google search) a free home design programs, such as google skechup7 or 8 or Cadsofts Envisioneer express which is also a free download.
now if you really have the Bug for drawing i would go to best buy and look for Punch Pro drawing software, it's great entry level drafting program and is blueprint ready, meaning you can design complete plans from Foundation, Floorbeams to the Roof Trusses, Plumbing, Elect, Hvac and so on, it also comes with some generic home plans you can modify, it also allows you to landscape the property and design each room with furnishings and paint for a 3D walk through.