To answer your first question, read this thread
http://www.project1999.com/forums/sh...d.php?t=118766
read the thread and a few linked threads in there and you will see how AC came to be where it is now and what value it has. Short answer, and IIRC, for tanks its 5hp=3ac...but that could be just for warriors.
Basic/average dps can be gained by doing a little math, best bet is searching the tank section of the forums for your closest to exact answer. From personal experience its best not to look at your dps as a Paladin, instead just use spells to hold those mobs on you and let someone else do the burning