New player, got some questions

[F6Knight]

Hey everyone,

I recently played Munchkin for the first time with 3 friends and we had a load of fun.
But we also had a lot of questions during our 2 games.

I already found a lot of answers in the FAQ and on the forums but I still have a few remaining questions.
My apologies if the answers are already out there and I missed them.

1) Can you still sell items for levels during the Charity phase or is this exclusively done at the start of your turn?

2) You may discard a class / race card at any time, even during combat, but are you allowed to play a new class / race card right away?
I assume playing a class / race card follows the standard rules and can only be done at the start of your turn, during charity or when you draw a class / race card during "loot the room"? Just want to be sure.

3) We had a "situation" during our game where I was cursed to always run away from undead monsters. I got a monster (not undead) when kicking down the door and needed help to defeat it. Someone who was at level 7 (while the rest of us were at 1 and 2) decided to help me in return for most of the treasures. I let him help because I had a devious plan. As soon as he agreed to help, I hit the monster with "undead" to give it +5 AND turn it undead.
Now I was forced to run away because of my curse.
My helper however was strong enough to defeat the monster on his own.
We argued for a while and then decided that the helper was also forced to run away.
Was I correct to assume that my curse to run away from undead also applied to him as soon as he agreed to become my helper?
By the way, he failed his run away roll and lost 3 levels from the bad stuff. He still ended up winning the game, but it definately slowed him down a bit.

4) When a gnome uses a monster to add it's level to his combat strenght, is that monster card "in play" for the duration of the combat or not?
If it's "in play", is it considered as a temporary item that gives +19? Can it be targetted by curses?
We had a discussion where someone wanted to use "annihilation" on the monster card I used to boost my combat strenght. We couldn't agree so in,stead he annihilated the monster I was fighting. This denied me the levels and treasure, but I didn't have to run away and possibly suffer the bad stuff. Afterwards I started thinking that I was wrong and that the other player had the right to annihilate the monster I used to boost my combat strenght. Is this correct?

5) If a monster ignores you, can you still attack it?
I was cursed into a female and a few turns later I got the Psycho Squirrel when kicking down the door. My 3 fellow players insisted that it had to be discarded right away because it ignores females. I insisted that I had the right to fight it. I figured, if I whack it on the head with a hammer, it won't ignore me for long ...
The argument was 3 to 1 so I wasn't allowed to fight it :(
Was this correct? Or did I have the right to fight it after all?