Umm wow.
The rules are easy, playing a winning game is much harder.
General rules here
http://www.thepokerforum.com/texasholdem.htmI suggest you go to an online poker site and sign up and play in the play money section. You will learn the mechanics of the game there. When you are ready, buy in for a small amount and play at some low-limit tables first then as you get more confident move up in limits.
Some sites have games where the blinds are 1 cent 2 cents so it is really cheap to play a lot of hands.
Also buy a few Hold 'Em books and read them at your leisure.
A few general tips to start you off:
Be aggressive, do not be what is known as a calling station. If you decide to be in a hand, raise. You will get a bunch of callers at the low limits. Unless your hand is total garbage but there are so many people in the hand ahead of you you are getting good odds to call, then you limp in and hope for a good flop. If you make a good hand on the flop then raise it up otherwise fold to a bet.
Be selective, don't just play anything and when you know you are beat, fold. Or if the opponant is weak and bluffable bluff him. Don't just call along and chase hands hoping your trash turns into gold.
Don't be afraid to lose money, play only with what you can afford to lose.
Don't slowplay big pairs, if you are playing at low limit tables you will get called if you bet your aces, kings, queens etc. don't be sneaky and try to sucker people. At low limits this does not work very well.
Pay attention, even when you are not in a hand.
Remember that it is the best 5 cards that win.
For example if there are 4 aces on the board (community cards) and you have a queen in your hand and your opponent has a king he wins as his king outranks your queen. But if the 5th card on the board is higher than both of you and your opponent's high cards you would split the pot as the best 5 cards are on the board.
Another example if there is a flush on the board (all five cards are hearts for example) and neither of you has a heart you split the pot as the best 5 card hand is the board.
If say you had a 2 of hearts you would still split as the best five card hand is still the board ex: a,k,10,8,7 of hearts your 2 is no good here. Though if you had the 9 of hearts you would win as you have a higher flush than your opponent. a,k,10,9,8 beats a,k,10,8,7
If you have a small pair say 6s and the board goes j,j,9,9,5 your sixes are no good. You now just have two pair Js and 9s with a six kicker and if your opponent has a card higher than a 6 he wins as he out kicks you. Though if the last card was an A you would split as long as he did not have an ace. So he could have gone in with a 2-7 (the worst starting hand possible) and beat you through the luck of the flop.
I see new players mis-read hands all the time and I did it when I first started that is why the long-windedness on that subject.
There is a lot more A LOT more but to understand you have to play some hands. So go play some play money poker..get to it!