cool username: not so nervous anymore are you? besides if you got a little lost you just post and lots of people here will lend a hand. For the wallpapers you may have to install the apk for it if it wasn't included (I didn't check as I don't use that rom) then you should be able to do a long-press on your homescreen and set your wallpaper.
SGTiger: if the only reason you are going to root is so you don't get stuck on an unrootable OTA 2.1 then no worries. There is a thread on this:
http://www.droidforums.net/forum/hacking-help/24707-unroot-unbrick-your-phone-using-sbf.html which basically lets you install something on your PC then boot up your phone while holding a key and within a couple of minutes your phone is just like stock, out of the box. From there you can then be where you are now and decide if you want to root and flash a rom or upgrade to 2.1 again.
SGTiger: if the only reason you are going to root is so you don't get stuck on an unrootable OTA 2.1 then no worries. There is a thread on this:
http://www.droidforums.net/forum/hacking-help/24707-unroot-unbrick-your-phone-using-sbf.html which basically lets you install something on your PC then boot up your phone while holding a key and within a couple of minutes your phone is just like stock, out of the box. From there you can then be where you are now and decide if you want to root and flash a rom or upgrade to 2.1 again.