You can get a lot of good conversations going on this site, so dig right in.
As far as setting rules and boundaries is concerned, I think that is a perfectly healthy step to take, especially in the early stages of your poly dynamics. Later on you might be more comfortable with things and be able to renegotiate some things. You can kind of figure that out as you go along.
I hope Polyamory.com proves to be helpful in smoothing out some of the bumps along the way.
Love means never having to say, "Put down that meat cleaver!"