character/profession swapping

Some questions:
1. if I have 4 characters, I can delete one of them to create a new one?
2. if I delete a character, i lose skills unlocked with that character?

3. if I change my secondary profession, do I lose skills i unlocked for my previous secondary profession?
4. I can switch my secondary profession as much over and forth as I wish?

To questions 3 and 4, yes you do keep your skills and as far as i have seen you canchange as much as you want. I personally change 3-4 times in a few hours. I have a good collection of skills and you easily change the role of your guy. As a side note, changing your profession is a cheap way to change skill point without using refund points. If you are a W/M and lets say youhave 12 in axe and 12 in smite,but youwant to use heals. Just change to some other class and go backto Monk. Now all of your skill point from secoundary class are back to put where ever.

The answer to the first two questions are yes and no respectively, and Dumbveggie84 already answered the last two nicely.