Is that possible?
If you can buy it, you can make it. With the right materials, tools, and know-how.
Which material should i use?
What do you have the tools, and skills, to make a platform out of? Use that material, then.
What is the different between these motors?
Hardly anything. And everything. Which to use depends on what you want it to do.
I assume i should use DC Motors?
DC motors are generally easier to use than A/C motors, because DC batteries are easier to get than AC batteries, and they weigh less.
If yes, how do i attach a wheel to the motor??
Drill a hole through the wheel and the motor shaft. Put a cotter pin through the whole and bend the ends over.
Any other i should know??