I've decided that I want to have a relationship with my biological father.
Is there a reason that you have decided you want a relationship with him?
I want him to be in my life and help me with problems I have.
It's normal to want a relationship with your biological father so he can be there for you when you need it. I think it would be good to try to talk to him, and get together when you can.
OMG I just found out my biological father is gay.
I think it's great that you want to have a relationship with your biological father and him being gay should have no bearing on that. Once you get to know each other I hope that it's a relationship where you can both be supportive of each other.