1、I have a two-bedroom apartment and I'm looking forward a roommate to share the rent

looking forward looking for

２、The addres is 3485 source street, apartment C.

--345 --south

It's across from a library and right next door is a pizza restrant

--the library ---right next door to the pizza restaurant

3、So you half would be $400

would be

4、Would you like to come by and check out the apartment.

5、I prepare you some questions to see if you match a good roommate

--I've prepared a few questions to see if you'd be a good match as a roommate.