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I just rooted my evo today so sorry if this is a dumb question. I've been reading all day and have seen this "CLOCKWORKMOD" used quite often. What is this and what does it do and do i need it?
It is a custom recovery.
When you power on your phone while holding volume down, you open hboot. From there you select recovery and the ta da...you will be in clockworkmod recovery. (Unless you have Amon recovery flashed, which is the same thing but different 'brand')
A recovery allows you to flash (install) the different ROMs, kernels, themes, mods, fonts, anything custom.
Also allows you to do the wipes necessary before the ROMs and kernels.
And another thing, it allows you to make NANDRIOD backups, which are important every single time you make a change via a theme or mod or kernel etc. to your phone.
NANDROID backups allows you to 'restore' your phone exactly the way it was before you made that change, in case something screws up.
Check out the Rooting for dummies thread (sticky up on the top of the page) and it should explain more about what a recovery is.

Thanks so much for the info! i been reading that thread for hours and used it to root. I wish there was a rooting for even more dummies that i can read because that's where i would belong.
This NANDROID back up.......Is this the samething as Titanium Back up Pro? I mean can i use one or the other?