Okay. So I'm in middle position in a full ring NLH game at FTP, one limper and some folds to me with a premium hand, so I decide to raise. I hit the "pot bet" button, and the raise that looks back at me is 4.5 bb instead of the 3.5 bb that I've heard called "standard". After toying around a little bit, I find the "pot bet button" gives me a 3.5bb raise if I'm the opener and one extra bb for each limper.

I understand that preflop raises accomplish two major things: 1) protect your hand from junk draws (A6o to your KK, for example) and 2) get more money in the pot. I assume that the 3.5bb raise to 3 limpers will get more callers than a 6.5bb raise will, but a 6.5bb raise will get more folds. My question is, then:

What hands do I want to:
-protect assuming low general skill level?
-get callers assuming low general skill level?
-protect assuming solid play?
-get callers assuming solid play?

Is there a general rule for 3.5bb + x for every limper?

And do these change if I'm suddenly in a MTT?

Also, first post. Hi everyone!

Edit: clarifications and such. I'm not too good at this post writing thing yet.