My tip for a beginner would be:

If you are just starting out, play ABC poker. Fold any hand that isn't arent royalties or pairs. e.g. K,Q J,A 10,10.
Learn the odds of your hand winning, if you are holding J,J and A,A comes out on the flop - don't be wreckless, but you will learn to 'feel' whether or not another player is bluffing.
Never cold bluff (until you know what you are doing), 90% you will be called out. Cold bluff = when you have absolutely nothing in hand to match with on the table.
Don't feel compelled to play a hand just because you are the BB or SB, but mix up your folds with calls.
If you know another player has a good history in the game, play exactly as you would against a donkey.
Watch what hands other people play at the showdown, and remember what they were and who played them - pairing this with the size of their bets will let you know what hand they are playing.
Beginners usually play safe bets in steady increments, mix your bets up a bit so you are harder to predict,

I'm still relatively new also, so take that as it is, however following those guidelines a have won around 7 out of 12 tournaments with each having around 300 - 400 players.

Good luck at the tables!