Hi,
Please let me point out one thing: I think the best way to learn is to do it yourself. We are here to answer your technical questions but it's not our responsibility to make the circuit for you. I looked up on the internet and there's a circuit which you can refer to: http://robotechno.us/high-current-h-bridge-with-mosfet.html
Also in Multisim component database, under Electro-Mechanical->Output Devices there are motors you can find to fulfill your design.
If you come across problems in the process of making the circuit, you are more than welcome to post questions here.
Regards,
Derek
Derek Z.
National Instruments