Good contracts? What do you mean by that?
If you meant: What are the "standard" (the common) terms in contracts?
I suggest you do a quick Google for some. You will probably find some contracts you can use as a base for your contracts.
Your contract is whatever you want it to be. You can get them to buy you a car, if you both(you and the client) want to exchange a beat on that principle.
Remember: Always seek legal advice from a lawyer.
Cheers,
Jordan