1. When your opponent is stealth and they try to attack one of your pieces and hit, can you PC that attack even though they are in stealth.

2. If there is blocking terrain like a big square of it, can you get in the middle if a flyer carries a grounded figure.

3. If you have leap/climb do you have to stop or break away when you base a figure.

4. Do a flyer have to stop when they base a grounded figure.

I know these are probably little rookie questions but I had a couple of problems with these questions in mind.

1) No you have to have line of sight in order to PC the attacker. Since they are in stealth you do not have LOS and cannot PC them.

2) If I undertand the question right, yes you can. If you're talking on an outdoor map it would be elevated terrain. indoor map, no.

3) No, you ignore the effects of terrain and figures on movement. No need to breakaway either.

4) No, flyers do not need to stop when moving adjacent to an opponent, under the new rules. They do still need to breakaway though if they are starting a movement adjacent to an opponent.

2. The only figures that can get on Blocking terrain are characters with L/C or flying.

So what you are saying is if i'm in stealth and trying to attack and miss, I can't PC my own attack? Does the same goes for perplex?

Yep. You'd have to turn stealth off before the action begins or before you try to perplex the stealthed figure, but it would be off for the rest of the turn leaving you suseptable to PC.

If you have MC and MC a medic. Can you use that medic to heal you own figure(s).

Yup, you can force an enemy medic (with MC) to use it's support on your friendly figures.