I think the important thing is to have an initial idea of the kind of character you want to train, picking its inherent and important skills, and later decide if to focus on that kind of character, selecting skills complementary to the initial ones, or a new sets of skills inherent to another class.

For example, if you decide to be a tamer, keep in mind that Taming, Animal Lore and Veterinay are key skills, or if you decide to be a mage, Magery, Evaluate Int and Meditation are the ones to select.

With this, you could choose or the skills listed above and become a Caster Tamer (one of the templates i enjoyed the most), or on the other hand, decide you want your tamer to be a warrior, picking a weapon skill, tactics and parry/healing and anatomy.

All is there for you to pick, just keep in mind the skills you choose are better if you have the ones that boost them.