If you want to explore the kinky world with your girlfriend, here's an interesting map.
Sex-Kink-Map
Pick something out, read up on what it means, talk about it, learn about it. That can really get you in the sexual mood. But note that more extreme fetishes are also listed there.
Otherwise, try the simple things. If she wants you to take control, tell her what to take off or what lingerie to wear. Determine how and where she should touch herself. Let her explore her body with your instructions.
When you try something, always think about how you want it to work, use your mind and always take it slowly. It doesn't always have to be perfect and exploring together is sometimes more valuable than the best climax.