Lesbians: What is it like to eat a girl out and how does it feel to get eaten out?

I'm bi-curious and I have a friend who is also, we're both virgins and she doesn't know I'm doing this, but I kinda want to know, just incase we get in the moment. So like, what do you do? What does it taste like, should I swallow? Sorry I have so many questions, I just want to know! 

Thanks sooooo much in advanced!

P.S I'm a girl