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Like with all other classes things are going to get very different when you hit level 18 so let's focus on getting you there. Slayers are a bit harder to level up to your class change than some of the other base classes so you'll need a good selection of skills to survive.
The skills you're going to want to focus on are Ghost Slash, Upward Slash, Thrust, and Wheel Wave Slasher. As always, feel free to spend your extra points elsewhere, but keeping those skills maxed will make your life a lot easier.
Ghost Slash is a high cooldown, high mana cost devastating blow that deals a very high amount of damage to anything a good distance in front of you.
Upward Slash is a fast knockdown hit that you can combo easily into your other attacks.
Thrust allows you to modify your dash attack to hit multiple times, giving you a good amount of damage for a small amount of mana.