You should tell all of your friends, everyone that is close to you and whom you care about. It feels really good to just be yourself and not hold in secrets. I'm bi and told all of my friends and they were all really cool with it and now it's just a normal thing. We talk about it like it's nothing. And it feels good not to lie to them and to know that they love me no matter what.
As for the crush, that depends on who the girl is and how strongly you feel towards her and all that. I have a HUGE crush on one of my friends. I almost told her, but I realized that I didn't want to make her uncomfortable and she was the type of person who might get uncomfortable with that. And, if you come out to your friends about your sexuality, that doesn't mean you have to tell them who you like. I hardly tell any of my friends who I like. Love 'em to death, but their mouths are huge.
As for the crush, that depends on who the girl is and how strongly you feel towards her and all that. I have a HUGE crush on one of my friends. I almost told her, but I realized that I didn't want to make her uncomfortable and she was the type of person who might get uncomfortable with that. And, if you come out to your friends about your sexuality, that doesn't mean you have to tell them who you like. I hardly tell any of my friends who I like. Love 'em to death, but their mouths are huge.