Here is some info on valuing your hands. I would also read about pott odds and position -- this will aid you in making the correct decisions so that you don't get trapped into hands that cost you all of your chips.
Also remember if a player is betting heavy they are probably on the jand that you were hoping they didn't have.
Players must be careful not to overvalue their hands. We see this mistake most often with hands like A10 and AJ. These hands are dangerous against a heavy raise because if you hit the Ace you will have a hard time folding against the higher kicker. Anyone following the guide below will inevitably take all or most of your stack.
Remember not to get pulled into paying a heavy raise with a small pocket pair. Your chances of hitting your trips on the flop are 1 in 8 and your probably dominated otherwise. Simple rule when playing a pocket pair. No trip on the flop no bet. Simply stated check or fold.
For beginners and even seasoned players this is a general guideline how you should bet hands-free flop.
HANDS TO RAISE WITH -- 1010 JJ QQ KK AA KA QA
HANDS TO CALL -- AJ A10 KQ KJ QJ 10J 99 88 77
Lastly do not chase cards. Against seasoned cash game players chasing will cost you large portions of your bankroll. It is very rare that people will actually catch the card they need to turn the hand into a winner. The only time that it may make any sense to do a little chasing is when you have a huge chipstack and your pplaying a passive player who is making tiny raises. Otherwise get out.
The last piece of advice to impart for cash games is take your time making your decisions. Dont just impulsively pay large raises because you were sue they didn't have it. Look at the cards on the table and try to figure out what your opponent is playing. Remember it is very rare that someone will move all in on a bluff. So if they do this and their is a flush on the board and your holding trips then your only option should be to fold. If they are making that move be patient because even though you got bluffed you will inevitably get their chips somewhere down the road when they make that move against your monster hand. Be patient and play hungry when you have the hands.