REQUEST: QUESTIONS ABOUT RM2K3

Well, these are the things that are driving me crazy and unable to really move forward with my game. Here are some questions that I have and would like answered by anyone willing to give a me some advice.

1.
Plan: I'm planning on allowing my characters to change classes after they've reached certain level requirements. You start off with a Base class, you can then upgrade to a Basic class and finally an Advanced class. Here's the layout:
CLASS
Base: Fighter (two branches) >> Basic: Knight >> Advanced: Paladin
>> Basic: Swordsman >> Advanced: Sword Master
I have 6 base classes with the same layout for each.
Question:
Is it better to use multiple switches instead of variables?

2.
Plan: I have a Barbarian class that has a Rage Skill, I was wondering how long it will last, I've tried to test it and it seems like one round.
Question: How long do skill effects last and can you change the timer?

3.
Plan: I'm trying to make an item/equipment that raises HP or MP, I know that you can do it for the other attributes but I'm having trouble.
Question: Is there a way to make this possible?

4.
Question: Is there a program that will allow me to see where the text bo cuts off?

5.
Question: How does autocomplete work?

6.
Question: How come mass copy doesn't work but mass clear does?

If anyone can share some insight I'd really appreciate it!