If you really want to crate train him I would start out slowly, there is nothing that is going to traumatize him more right now then forcing him in there against his will and leaving him in there for hours on end right away. Start feeding him in there, but leaving the door open, maybe move his crate to somewhere in the house that he feels the most comfortable, put a blanket over top so it can be a nice dark little den for him. Do not force him in there. But only give him meals in it, only let him have his favorite treats in there, or his favorite toys. Eventually you will be able to get him used to the crate and have him going in there on his own, but it's gonna take alot of patience, and alot of time. Because you don't know his history for all you know he could have some horrible memory associated with the crate, so let him get used to it on his own terms.
After a while you can start closing the door on the crate for 1 minute, then 3 minutes, then 5 minutes and so on and so on. Key is, is to keep him occupied and not thinking about being locked up in a little cage. There are a couple of really good threads in the training forum dealing with this, maybe someone else who knows their way around alittle better could help you find it.
Good luck!