As far as technique goes, there are videos on YouTube that you can look up to practice from but some are good and some are bad, and it depends too on exactly what techniques the school / casino wants you to use. I know a lot of American
casinos don't seem to be too keen on pitching, for example (which makes me sad).
Generally speaking most places will use the riffle-riffle-strip-riffle-cut method for shuffling, so practice that. You'll want to be practicing with 100% plastic cards (Copags, KEMS or similar) because paper cards will fray at the edges very quickly and make it a nightmare.
Aside from that, one thing you can definitely practice at home is working out side pots. Deal seven hands, put a random pile of chips in front of each one, assume everybody is all in, and then work out all the side pots. Chances are you'll never have to deal with a situation that complex in real life, but if you're prepared for that then you should be able to easily handle the 2-3 pot situations that do come up on a regular basis.
Over compliment=great tips. Great Job, nice bet, awesome call, all that stuff. People like to hear it. That said, don't be annoying about it. Do it for big pots=more tip money. Also, make people feel comfortable, always use there name when they win a pot, "Great job John," etc.
I don't live in a country where dealers are allowed to take tips, but regardless - I'm pretty sure a dealer should
never, ever be making
any kind of comment on the outcome of a hand or the way someone is playing, whether it's positive or negative.
If you want to make good tips just be good at your job. Don't screw up, deal quickly and efficiently, keep the game moving along so everybody maximises their hands per hour (thereby maximising the number of hands you can receive tips on) and you'll be fine.