from the questions i see that youre asking... you may wanna try these sites for some very basic stuff that most djs need to know... this will save you time and it will also save you from being flamed for not using the search button : )

http://music.hyperreal.org/dj/AVH/

http://www.vutag.com/vutekframes/top.html

i know there are a few more but i couldnt find them..i just used google for htis

I think there are some other posts in this section fairly recently that discussed what sort of needles are good. I personally have the Shure White Labels and love them, they're perfect for what you're after. Also, I hear a lot of good things about the Ortofons, which probably the majority have.

As far as tone arm weight, the amount of weight you set varies. I have mine set rather heavy because they tend to skip when I have it light. You should probably shoot for between +1 and +4 grams.