I played 3 games back and forth.
One as a warrior.
One as a Mage.
One as a Survivor.
In all three I used mostly the sword or Axe.
I had bow for each but the magic seemed faster.
The freeze spell is the best to use but even better if you have freeze on a weapon.
I got as many skills for each as I could.
You have to uplevel each skill up to level 5 and when you receive skills points to give out to the skills...you only get one skill point at a time.
You may use the skill point right away or like the game keeps telling you...you may save them up and use them later when you have more to give out.
Repair will let you do it yourself and save money and also if you repair yourself you will make more money on the item when you sell it.
Lockpick is also very important to get because there are many chests and doors in the world to open.
Alchemy is another important one because you can than just buy empty bottles and make your own by picking herbs and mushrooms to use in making the potions.
Pickpocket you only need level 1 for a Theives Guild assignment.
Enchant item is a good one because you can then use all the charms you find to put on your equipment.
Well thats all I can think of for the moment.