I have no experience with Time pedals but with Shimano road pedals, the tension adjusts via a hole for an allen wrench on the back of the pedal. There is usually some sort of indicator showing how tightly it's adjusted, too. I set mine to the easiest setting when I first got the pedals, and I've had absolutely no reason to make them tighter, so they're still set to super-easy tension (I guess if you're super strong it's possible to pull out accidentally? This has not been a problem for me ).

If you've never set up cleats before, it's not a bad idea to have your LBS do it for you, or have one of your teammates help you. It's not hard to do (I do my own cleats now), but it is important to get the cleats positioned correctly, and if you've never used clipless pedals before you don't really have a frame of reference for how they SHOULD feel. Basically, you want the ball of your foot more or less over the pedal spindle. But there's a fair amount of side-to-side and angle adjustment that can be done, and you want to get all of that stuff right.