Remember to take a deep breath and relax. A lot of people get overly tense or nervous. Take your time, and don't rush anything. I totally agree with the pre-flight mentioned above, but don't get discouraged if your instructor finds something wrong with the plane. It's rare for me not to find something wrong with a plane the first time it comes to the field. Usually it's minor and we can fix it right on the field, or it's a minor thing to be taken care of later at home.

How much do you know about how an airplane flys and how the control surfaces do what they do? It's not necessary to know this stuff, but I find that students who know the "theory" of what is going on learn faster. Simularly, it won't hurt to read some of the threads on here about basic landing procedures and basic plane handling. You won't be landing for a while, but having the ideas in your head makes it easier to get the fingers to do their thing. With, some students I have to spend a fair amount of time before flying explaining what's going to happen and how things work, while others already know the basics and they tend to pick it up faster. Which is another way of saying do your own self-paced ground schooling, it will save you time and brain-space at the field.

When flying, relax, and think smooth. Small stick movements held for a longer period of time are better than a large movement for a short period of time. In other words, if you want to bank, move the aileron stick to the side just a little bit and hold it there rather than trying to apply lots of aileron for a short period of time.