Advice needed - Renting a room in my house

[Shaerza]

Considering renting out one of the extra bedrooms in my house to supplement income for the summer, but I am not really sure where to start. Will be to a guy I know fairly well and trust wont destroy anything, so I do not think that I really need to get a lawyer involved in the process at all.. but I will probably still want to have signed contracts etc..

Can I use some of the generic rent forms that are available on the web and still protect myself in the case that anything does go wrong? Can you add extra terms to these agreements and still have them be binding?

Any other general tips/advice would also be appreciated. The idea does not seem like that big of a deal to me currently, but I am not sure how thuroughly I have thought it thru..