a few questions from a newbie

[Paull51878]

Hello everyone

I just started playing Munchkin last week and I have to say I love it.

I just have 2 questions:

1) If I buy every Munchkin Game, like Munchkin 2,3,4,5,6,7,8 , are those all to be played seperately or do I combine them with the original Munchkin game? Im confused

If I buy Munchkin Zombies 1,2,3, same as above, do I play each seperate or combine them? Can other games such as Zombies be played with the original Munchkin?

2) I recently bought a package of the Munchkin Pawn figures pack of 6. The card it comes with states "Any time you are entitled to go up a level – or when you do something that WOULD earn you a level if you weren't already Level 9 – you may, instead, place a munchkin pawn in front of you. In any combat, you may discard it for a 1d6 bonus. You may only have one in front of you at a time. Unless, of course, you "lose" these rules and tell the other players that you're allowed to have more. Six is a good number."

What do they mean by in any combat you may discard it for a 1d6 bonus? I have no idea what a 1d6 bonus is

Thank you all for your time and have a great day

Paul