Question about creating my own lease/contract/addendum(?) for a potential roommate?

Long story short, i got screwed over by my last roommate. I am moving into new building and need a new roommate, but i want to legally protect myself with some sort of document. The apartment company itself does credit and background checks, but i'm stuck with everything if he/she bails suddenly. (he/she will be included on the lease, but i'm still responsable for the payments) Also worried about if the roommate refuses to uphold their end, and causes problems. Who could I talk to about this? A lawyer? Or is there someone else i could talk to? Thanks!