Group sex is great.. If you are seriously interested in trying it, search online for swinger clubs near your area. It can be hit or miss, some nights a place is hot and some nights... blah.
Of course the best is with people you know, makes everything waaaay easier, but then again, how many people you know are going to be okay with having group sex with you? Yeah, so thus swing clubs are useful.
And obviously, condoms are a must. Also, if you are homophobic.. well good luck, you got to be able to be turned on with hard cock around and other guys sweating, ect, (there is a LOT of body contact in an orgy you know...) there just isn't any way to get around it. After four years of being in the swing scene, I've turned somewhat bi, so it isn't a problem now, but at one time it was.
Good luck. Everyone dreams about this kind of thing, but most people are too scared to go find it. It is worth it!