The best thing to start off with, is grinding weapon mastery, and farming skill points, so you can unlock new Sword Skills and Battle Skills. Auto-attack may be a cheap way to do it, but it's also the most effective way. For that, focus on obtaining skills that raises your attack speed and just hack away at the enemies. You'll also want skills like Perfect Style and Hyper Armor to help protect yourself and to temporarily give you perfect accuracy.
There's a lot to fill you in on though, so I'll let you digest it bit by bit
