Help Collecting Hardware Parts

[bitMario]

I like to start building my own platform simulator so i order this "saint mega 2560 r3" and i am not sure if this h-bridge (http://www.ebay.com/itm/400569497467) will work with my arduino board. I bought also 3 motors 12v 15A . Can you help me with that? Thanks!!!

*My idea is to do something cheap to learn first,if you can suggest me similar cheap parts it will be ok!!

[sirnoname]

In case you are using whiper motors and a racing seat mover:
You can say ~2A for only moving the motors with gear.
15A*12V=180W, normal and save is around investing in 300W per whiper motor. Persons < 80kg.
If you use less, you have not a powerfull movement, it only moves!
You can calculate the power in watt to acceleration. More accelerations means more faster reaction to the road. Less powerfull means reduction of quality of movement. Cheap but only a start

[bitMario]

Can you suggest me a reliable source to buy my parts soon ? Thank you for your responses !!!