Skills are used in combat to fight effectively. No class works effectively without skills, so get used to them!
Skills are "unlocked" by increasing your attributes. There are some basic skills available right from the start, such as Power Attack, which does +5% damage for a very low mana cost. As you use your skills, you will level up your Concentration.
Skills are very easy to use. Simply look for a skill to use by sending the command "!skills" followed by a level the skills should be around (try your highest attribute's level for the best skills for you to use), and then use that skill in combat by sending !use [skill name]. Don't just rely on one skill, experiment with combinations and you'll find there are some incredibly powerful combinations to be found indeed.