Advice on future sex?

I've had experiences before like giving guys massages and receiving them, and sleeping next to them in bed but never actually anything sexual or touching their dick. I'm 16 and there's this guy in school who I talked to and we talked for a few nights really late about stuff we find attractive (he's gay and I am too) and he was like "you can fuck me if you want." He said his dick is like 8 inches and he's a top. I've never done anything really actually involving sex so I'm not sure what to do. He's really hot and he thinks I'm good looking too, I'm just nervous about it.I don't want to bottom honestly, I'd rather just suck him off but I didn't ask if we could do that. I'm also not sure when/where we could do it cause our parents are both home most of the time...any ideas? Thanks.