i been to wind spear hills i done the shadow ruins i done everything in the temple district i have done umma hills trade meet and the druid grove and the planer sphear is there anything else i can do before i can go to the under dark

There are a few quests in the Graveyard District and then there are the Shadow thieves quests in the Docks.

You forgot the de'arnence(how ever the hell you spell it) Hold quest.

Flail of the ages man, you gotta have it.

done all that

You can do Kangaxx, although it might be to difficult if you weren't to the the underdark yet.

Did yo do all of them NPC quests?

Found the killer in brige district?

quest of the unseeing eye?

got the talking blade?

Go visit Renal Bloodscalp in the docks!

done all that but i havent found the muderer at the bridge district i only got as far as talking to the tanner

SPOILER
.
..
...
....
.....
......
.......

Give him a kick in the ass and he'll reveal it himself. (so just give the tanner a beating)

ill give it a try ill just try not to pulverise him in one shot like i do with so may creatures

if you have Aerie, Quayle will ask you for help. That starts the quest with Haer Dalis. Some decent Xp.

did you try the Jaheira Harper quests?
** Spoiler ?
8
8
8
8
8
8
the Ployer curse, that whole harper building bit with the bird thing, etc? It all yields one cool battle with a buncha uptight faux-harpers, and some nifty booty to boot!

at the risk of sounding flat....done that