Advice for talking to a boy?

So I need to talk to a boy Monday morning, and I just don't know how to call him over. Should I go up to him and ask to talk in private? And when I do, should I tell him what I need to talk about, or just spil everything?

Also, how do I have less fear of talking to him? I'm so nervous!!!

P.S

Its not a confession or anything, just some personal questions

And by called him over, I mean going up to him