No matter how fucked it is, or may have been, yuo can rebuild it by doing the following:
obtaining a secured credit card and being on time will all payments.
applying for credit at several other places (Home Depot, Wal-mart, etc) and being on time will all payments. (don't overdo it and apply for credit everywhere, this will be reported and can damage yuor credit rating)
financing a car and being on time will all payments.
of course, the trick is being on time with all the payments. If yuo screw up a second time, YUO=FUCKED
it will take a year or two but trust me, it really does work.
that is all
Car Key Boi