I wouldn't say it's the "wrong" forum.... it's still just a general question of sorts, but caps are very common in working on monitors.

Axial caps are the ones laying down on there side with one lead coming out of each end.
Radial caps are the one standing straight up with two leads out the bottom. (most commonly found)
The majority of caps are polarized (a + lead and a - lead) but then there are Bi-Polarized caps that are generally marked with a "BP" which are just that... not polarized. (no + or -)
As for the ratings and size issue:
The
size of the cap doesn't matter, it's just a difference in manufacturer design, etc.
What does matter is the uf (MCF) and the voltage ratings.
When replacing a cap the uf rating (10uf, 100uf, 22uf, 3500uf, etc) should always be
exactly as the one you are replacing.
The voltage rating can be the
same or
higher than the one you are replacing, but never lower.
Mouser is a good source for lots of little parts like this.
http://www.mouser.com/It's late, I'm tired, hope this helps out a bit.