How big is your house and how many bathrooms? It sounds like you already have three people living there. Adding two more people would make five correct?
If the house isn't large that's a lot of people sharing a house. You might find that you'll have to charge less to be competitive to make up for the lack of space, privacy and bathrooms. The type of people that can afford the lower price and are willing to put up with such a situation are probably less than ideal individuals.
Make sure you get first and last month's the day they move if not before. Get a back-ground check. Get a credit check. You can find leases online at websites like:
http://www.legaldocs.com/lease-s.htmMake sure you stipulate in the lease what is covered. Normally that means quiet enjoyment of common areas (living room, kitchen etc...). How are you going to deal with tenants who don't take the trash up, never do their dishes, camp in front of the tv on the living room couch for hours on end, noise, their guests coming and going, them using and breaking your things? All this can and will happen. Think even to the point of running the dryer (I can only assume with a load of rocks) at midnight which happens to be outside your bedroom and keeps you up at night from the racket?
I rented out two rooms in my condo for years. I probably had 10-15 roommates. I don't even remember them all. Not one of them every vacuumed, mopped or cleaned out the microwave. I was almost always the only one who took the trash to the dumpster. For me it meant my mortgage was pretty much always covered and I just had utilities and condo fees so I grinned and beared it. But it wasn't exactly easy money.
Oh yeah... one other thing. I ended up putting deadbolts on ALL the bedroom doors. My nice TV was in my bedroom. One of my tenant's boyfriends stole my laptop out of the living room where I'd left it over night. After that deadbolt went in and everything of value was locked away. Didn't matter if I went to the car I locked the room. Each tenant got a key for their door when they moved in and they got their deposit back once I got the keys back in my hand.