http://www.htmlgoodies.com is a favorite of mine. As far as the centering goes, try <div class="center">.

OMGoodess!! You're so good. Thanks so much for the help!!

I have skins too. How do I edit those sidebars? I notice that the sidebars are different in each skin. Sorry for all my questions. I'm not used to doing this. :)

Honestly, I don't know a lot about php, but it's not too hard to figure out how things work (plus this forum is a HUGE help). The sidebar itself can be tweaked through the _main.php in each skin. Everything's fairly well labeled in there, so it shouldn't be hard to find. You'll want to check out the .css files in each too and make sure you know which tags go with/do what. It might be easiest to stick with one skin (the custom skin is always a good one to start with) until you have it how you want it. I know it's helped me familiarize myself with a lot of things in b2evo :)