Gliders are generally docile and easy to fly. If you've mastered your trainer, you'd probably be able to fly one. How are you planning on flying? Tow-plane? Hi-start? Slope? Your next step should probably be to decide which way to go (ask in the glider section) and your future planes depends on that. Your next plane should be a non-scale glider to practice with, then you can move to scale gliders. Have you tried this question in the glider forum? You'd probably get more help there.