Friends,
i am new to the community, got an Arduino uno board and with continous rotating servos i made a basic vehicle. front has 3 micro switches as bumpers.
For rapid prototyping i made more or less most parts from cardboard.
cheers
Good work! You can also try to make a line following robot if you're going on advanced one's. 
Good work! You accomplished alot with improvised materials.
For rapid prototyping i made more or less most parts from cardboard.
Don't forget the low temp hot glue!