Originally Posted by namicle
I was looking through the used market and my main worry is since i dont know how to play yet, how will I know if something wrong
Sorry if this is a bit academic, but in case you know as much (and as little) as I did when I got started, here's what I did when I bought my first bass.
I brought it into a local music store for them to give it a good once-over. The guy took a look at it, suggested some new strings (D'Addario Chrome flats, 45-100…very easy on the fingers when starting out) and that it get a "set-up". Not knowing what that was, he then explained that they'd install the new strings, set the string height/intonation, make sure all the electronics were functioning, check the potentiometers for dust/grime and clean them out if needed.
When I got it back, everything was ship shape and in good order for me to start practicing. He also added that, except for the strings and a little dust in the pots, it was in remarkably good shape despite the chips and cracks in the finish.
Oh, one other thing, Bassisgood4U's suggestion of a Classic Vibe bass is an excellent one. I got a CV Jazz recently and it kicks serious butt…so much so that I won't even say "for the money". It looks/sounds/feels like any quality bass should. I see them up for sale all the time on Guitar Center's used database. Most of them get listed for about $250+shipping. They also have a decent return policy (30 days, I think) if it's not "the one" for you. http://used.guitarcenter.com/usedGear/index.cfm