Enhanced effect is the primary modifier to look for on your weapons and probably your armour as well. Then go for a charm with strength or dexterity and you should be good.
Jubilance adds small amounts of experience while you're in town / not fighting or in catacombs (basically the same times when you can regen). So if you've got 3 jubilance you'll get 3 exp per second. It's barely anything at all unless you've got a whole lot of it. I guess that some people have done entire climbs using only jubilance
well actually it won't level you up but it'll get you 1 exp away from a level so the people who do that just have one kill for every level they've gained. It's crazy
Anyways, you can read about all the stats here:
http://ladderslasher.d2jsp.org/index.php?g=15