Good tips from Jaminos. I'd add:

Do not open with Provoke. Provoke gives you one more point of enmity than whoever has the most hate. If someone steals hate during a fight, you can quickly get it back by using Provoke.

Starting a fight with Provoke wastes that skill because it basically gives you one point of enmity. You'll get more enmity by hitting the mob one time. Start your attack by doing Shield Lob --> Halone combo --> Flash.

Provoke is for the times that you lose hate, so you can get it back quickly. And as Jaminos said, follow it up with Flash --> Halone combo to make sure you jump up a few more points.

Also, maybe visit the forum for your server and look for a Free Company so you can consistently play with people you know and enjoy. They're more likely to help you develop.

Glad to hear you want to improve. That's the first step to improving.