keeping to a higher team is usually easier i find, pace + bounce means you can stand further back, and don't normally have balls dying on you. basicaly my advice is:
Standing up: Make sure you have your weight forward on the balls of your feet, rise quickly with the bounce of the ball. so you can take any stumpings, and also try and resist the urge to step back as this will make catches harder. come up with the ball. Mark out off stump and then ( your foot,width of foot, then foot again) also mark this on leg stump, i can draw if you don't understand.
Throwing in: stay on your toes, and try to get the ball before the bounce, as the bounce just complicates things. nice soft hands,
Standing back, move your feet, and always try and take the ball in line with your head, and give lots of give