To be honest, not good. But if you have the money seek counsel. I went over with my case with my lawyer and he pretty much summed it up with what I already knew, she would get full custody.
My advice just prepare yourself that its not going to go 100% your way. My sons mother is the craziest person I have ever met and dont really approve of her redneck ways (she lives in Georgia) but she is doing a good job raising our kid, which is a surprise I didnt see coming. So it may not turn out as bad as you think right now, and Im happy to pay the child support and still get to see my kid.
The only thing that you can control is being a good father, and dont allow the court, her, or lawyers to change that. Good luck.