Since I've never been with one before, I'd want to start with just the one. I'd want to try it all; being a bottom, sucking and swallowing and of course taking it anally with her cumming inside. It's all well and good shoving toys up there, but I've got to try the real thing. I'd want to be a top as well, you gotta reciprocate, right? I'd love to be able to give it anally as well as take it.
Once I'd had some experience, I'd definitely want to try it with two; taking one anally and one in the mouth of course and rotate so everyone gets a bit of the action!
After I'd got a fair bit more experience, I probably wouldn't say no to some sort of orgy. Not with a silly amount, probably something like four or five. One in the mouth, one in the rear, stroking another, one servicing me and rotating after each one has come!