You can play chords on bass, but it's a well known fact that chords in most part suck ass on bass... Especially when you just strum all strings at once, it sounds like crap, even picking two at once has a very dull, flat sound... So it is best recomended to play one string at a time.
Anyway, in addition to what clayman already pointed out, i recomend
www.activebass.com