So here's a few tips which I find useful when playing. They're from an amateur, me, and I'm sure many of the pros would not endorse them. But I feel I've done well playing Texas Hold 'em the Marty way.
It's almost always bad to go all in on the first two cards. You should only do it with a pair of Aces, or with Jacks or better when you hold the fewest chips at the table. The game changes too much over five shared cards, and you lose often even starting with that pair of Aces. Generally speaking, don't go all in on two.
You will lose more hands than you win. That's the nature of the game. So while it's okay to be aggressive, and you do have to be a bit of a bully to play well, the cards will be against you more often than for you. Be selective with your aggressive play, and remember there's a fine line between aggressive and foolish.
If after the turn you need two cards to earn a decent hand, play conservative and be ready to fold quickly. The numbers are against you; you aren't likely to get both cards.
Bet from strength. If you have a hand which, in studying the cards, less than 4 can beat you, be aggressive.
I do not like the bluff. It's too dangerous. Still, you should make small bets or make small calls often enough even with lesser hands to keep your opponents unsure of your tactics. Part of the game is creating uncertainty about your motives when at the table.
Beware the wild bettor. He's either very aggressive or very stupid. Don't get into raise wars with them. They're depending on luck and, I mention again, the cards are generally against you. Let the others at the table deal with those players. They'll usually burn themselves out within a few hands.
Don't call a high raise unless you know you've got the cards to beat it. I know, you can never really 'know'. But a clear headed study of your hole cards against the common ones will usually give you all the information you need.
I think that's all for now, although I believe I'll share more tips later. But I can't give away too much, of course. I may play you one day.