Former Rental Run Down. Need Contractor or wholesaler HELP!

So I bought this property 6 years ago and had only one tenant. They were great, paid their rent, late fees when applicable. They gave me their 30 day notice last month. When I scheduled a walk through inspection, they moved out before I arrived and mailed me the key! ( bad sign ) So I did a walk through and the place is pretty bad! WAY MORE than the deposit they left me. They gave me their forwarding address, but its in TEXAS. ( this property is in CA ) and I am not even sure if that's real. I don't know what to do now. Should I sell to a wholesaler? Does anyone have a good contractor in the area to refer for repair estimates? I could try and sell but not sure what its worth without fixing up. Would love to hear some advise.

DO you guys think I should sue the previous tenants? worth it?