If you are still in Farglow, after you speak to Morgana you can talk to the 3 trainers as often as you wish to switch your starting class (as 30johner said, this only effects your initial weapon, stats and skills; after that you can do whatever you want). You can repeatedly enter the training area to fight summoned goblins, and get a feel for how each style of play works, and which you feel most comfortable with.
There is a skill book hidden in the training area. You can use it to...
learn Lockpick to open a chest hidden behind a bush by one of the buildings.
Mindreading everyone, you will be directed to a key in the training area which will allow you to open the chest by the wizard, which could give you potions, gold, or perhaps some equipment to get started with.
Mindreading will also give you a couple ways to lower prices at the merchant, and the training area may give you enough gold for an upgrade or two.
If you save before running the crosshairs over a chest (or merchant), you can reload to get different stuff in the chest (inventory). This can be helpful near the start of the game (or when you need specific ingredients for a potion/enchantment later), but used too much you would just be wasting time and possibly making the game too easy.
In addition to this forum, there is a
walkthrough and a
guide (with screenshots) for the game, though after Farglow I would suggest only using them when you get stuck, or skimming through areas you have already done, to make sure you didn't miss anything critical (you are not going to get everything on a first playthrough, anyway).