The biggest one I can say is: know your group. TMP is a modern game, and a relatively realistic one in game play. I've had players charge into certain doom, unable to recognize their peril or know how to address it. This may not be a problem depending on your OWN level of knowledge, but you should be aware of it so you can give helpful information that their characters would know even if the players do not.
Another one: know the game world. TMP modules tend to assume a certain series of events, a certain path of travel. Teams may well have different ideas than the game designers, and you don't want to force teams to do things they don't want to do. Prepare for them to go off script, go into areas you had not expected and do things you had not planned.
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