I think you got a prof tenant, his purpose now is to delay the case, try to live in your house free for long time. He can also challenge your filing, so try to get a evict attorney mentioned by landlord_china, to make sure you don't make a mistake. One mistake will cost you to start all over again. Depends on which state, you need find an eviction atty who is fimilar with the landlord and tennant law.
Good luck, keep us posted.