This is just how I play Party Poker's-I'm no pro
I always raise preflop-raise size depending how high Party Poker is. For example-with 22, a 3x BB raise, Jacks, 5x BB or a push all-in if I'm shortstacked. I always raise if I hit a set after the flop, 5x BB at least. I don't slow play a set, especially when I hit it on the flop; slow play runs the risk of your set being beat. I'd rather raise ad have them all fold, then to slow play and get beat.
I disagree with most of this.
For a start, raising with 22 preflop is probably not advisable, but the issue here is saying your raise depends on your hand. If somebody works this out then it's highly exploitable. Also, whether to raise/fold/call/all in depends on so many other factors that saying to "always" do this is wrong.
On the flop we typically talk about bets in terms of pot size. Eg, if the pot is 120 you might bet 2/3s (80) of the pot. How much you bet also depends on lots of other factors: the texture of the flop, how many people have seen the flop, your position, etc.
A couple of example hands:
You hold 66. 5 people in the pot which stands at 1000. You're first to act:
8d 9d 6c
Not a nice flop. The bet needs to be big enough to price out draws. But the other issue here is you're first to act. It's easy to pick a bet to price out one opponent, but if the first player after you calls then he's probably pricing in everyone else to continue too. This is a scenario where you need to bet big, and depending on your stack (if you have say 1500) you might even just move it all in now.
On the opposite side of the spectrum:
You hold 88. 5 people in the pot which stands at 1000. You're last to act:
2c 8h Kd
Everyone checks around to you. This is a situation where slow playing is quite safe. There's no straight or flush draws out there, so it might be an idea to let someone hit something on the turn before trying to get them to part with their chips. Of course, you run the risk of being out setted, but that would just be unlucky.