Golftec fitting questions

So as part of my lesson package I get a free fitting. I know a lot of people are not overly impressed with their fittings but since its free i'll at least give it a go. I play Standard length, standard lie Callaway Rouges and my driver and woods are Mavericks. All are only a year or so old so i don't really need new clubs. Having never been fitted what metrics should I pay attention to and what questions should I ask for whenever I do choose to upgrade?

There is also the chicken or egg question of do I get fitted before lessons or after lessons.