As c9 points out, isolation and playing the situation is much more important than hand selection per se. But if you're new to 6max, suggest you try something like the following ranges by position (if you don't have pokerstove, download it, it's free) and vary/increase your ranges as you get more comfortable reading situations:
utg- 8%
mp - 10%
co - 15%
btn - 30%
blinds - 8%
This is a pretty tight range for 6max, it'll probably get you to something like 16/13. "Good" TAG's run around 20/18 (I'm not there yet). "Good" LAG's run like 25/22.
Hope you're using a HUD...