With the team comes liability so I would suggest contacting a good attorney who specializes in employment contracts.  You may also find useful info on www.mybizoffice.com

Most non-competitive contracts are not legally binding, and the person who signs it won't know that, so just include what you would want them to do, should they leave your team. As long as they believe it's binding, they'll follow it. But  you'd have to go through a lot if they broke it.