[MunchkinMan]

Welcome to the wacky world of Munchkin!

From what you've described, you have one set (also known as a core game) and two expansions. What it sounds like you're asking about is blending, which is when you play with more than one core game (each from different genres, like Munchkin, Munchkin Cthulhu, or Munchkin Zombies), plus any expansions you want to add in to the mix as well. Since you don't seem to have gotten anything from a different genre, you're not doing that.

With respect to expansions: You can add as many expansions and boosters as you want, or feel you need, to increase the variety of your games. When it comes to the original Munchkin game, you can easily add the first two expansions (Munchkin 2 and Munchkin 3), without introducing any new rules. Munchkin 4 and some other later expansions to Munchkin (Munchkin 5 and Munchkin 8) adds Steeds and Hirelings as a new types of cards that have specific rules associated with them.

I always suggest starting off with a single core game, then adding expansions as you gain familiarity and comfort. However, if you want to jump in and throw in all 7 expansions to Munchkin immediately, we here can't stop you.

Blending genres is an advanced topic which we don't discuss in any detail here in the 101 forum, so when you're ready to brave that, we can help you in the main Munchkin forum.