My brother wants me to suck his dick

I'm 27 and my brother is 32. We've been alone for a couple of days and were flirting but didn't do anything. Today he told me he wants me to suck his dick. I'm willing to do it but I want to ask some questions. First: I'm new to this and I don't know if I need to do it a certain way. Second: does it hurt? Third: can I get pregnant if he cums in my mouth? Please help