Found a Great Deal, Now Purchase Agreement!

[Peter Bui]

Hey all, 

Quick question. I found a good deal from my coworker and we have decided on a purchase price and he has agreed to help finance the deal through owner financing. My next step is to write up a purchase agreement so I can include the inspection contingency in it. Do you think I should get an agent to do this or a simple purchase agreement contract will do (I will have my attorney look at it). 

Anything else you recommend to add in contingency section? 

Thanks! 

Peter Bui