explain please!

Sofia
I'm 17 and have a lot of questions about sex. I never know where to turn to for sexplanations except this place so here are some questions I have:
when a woman "cums" is it the same as when a woman squirts? If not, how do you know when a woman is cumming?
When a woman orgasms, is that way different than cumming? 
when I finger myself I don't really get wet until I'm done and reach that "orgasm". is that normal? 
Also, how do you know if you've orgasmed? I think I've had orgasms because I reach somewhat of an orgasm but sometimes they're very tiny climaxes.