I still have the needles that came with my turntable and somehow I want to change them, maybe is because they get some kind of dust and makes the sound awful but I don't know which ones should I get, I don't scratch at all and I just play stuff like techno and trance .
The other question is kind of hard explain it but I'll try so here it goes !
the arms of my TT's come with a stuff (don't know what the name of it in english , sorry) where I can balance the weights of the arms. what I need to know is how do I know if I seted up right? It sounds right but I might have it wrong !
Thank you guys !

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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.