There is a first time for everything in life, isn't there?
When it comes to whatever sexual activity, you should definitely expect nothing but a new experience with new people. Threesomes do come with many pitfalls, you can find plenty of advice in the internet (which I will not repeat here) yet they are coming from other people who made their very own experience. As they are not you, nor any of the other persons in that very moments they made their experiences, it is difficult if not impossible to predict what might happen.
I for myself had a terrible experience with two men who were super egoistic, and who behaved as if they were in a porn movie. No style, no substance, no feelings - just the interest to put their cocks into a beautiful woman, as seen with many many other men. This experience was worse than bad, I will never again do it again - sex with Mr. ZeeTee is the most satisfying and fulfilling experience for me, a second person would only bother our deeper than deep connection during our sexual encounter.
So now I still gave you a little input about some pitfalls... perhaps it would be a good idea to go to a club to make first experiences and to meet like-minded people. Because to start with, finding the right partners for threeseomes is everything else but simple.
will, of course, be aware that I'm afresh...but still, I don't wanna seem like a beginner 
here is my email
