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Starting out as a Mage is fairly simple as opposed to some classes, but you're going to have a little bit of trouble getting used to it if you expect to be getting hit - at all. The Mage is not designed to be touched at all in physical combat and as such, on your road to level 18 for your class change you'll be focusing on high power skills keeping you far away from the thick of things.
To get to 18 the easiest way is probably to max your Magic Missile, Panzer Hodor, and Ancient Library skills. To be honest, you can get to your class change fairly easily with just those three skills, but you may want to add some points in Mana Shield or Provocation Doll :Shururu if you're having trouble.
Magic missile works pretty much like it sounds - it's a missile that shoots in a straight line, can hit multiple targets, and can be slightly controlled after you launch it by moving the keyboard (or gamepad, if you're using one).
Panzer Hodor is a mean goblin summon who frankly can take on most enemies without your help. He starts off just throwing rocks and smacking things with his club, but as he levels he gains new abilities such as hurling bombs and throwing many rocks at once.
Ancient Library is a mana regeneration skill which will allow you to cast your other spells without having to waste too many mana consumables.