What you list there looks like a pretty good men's wardrobe already to me. You've got a really nice vetiver, a really nice cologne, a great oriental, a nice lavender, a nice aquatic, a great gentlemen's barbershop frag. And don't let anyone tell you that AdG is a badly made frag. Nothing wrong with the stuff at all. Nice job, man! I'd say, esp if you're concerned about spending money on stuff you're not sure you love, you're right when you suggest that it's time to slow waaaayyy down. Wear, read and write about what you have until you know it really well. Wear things several days in a row until you start to notice how they unfold, and start to notice the little tucked-away notes that are harder to pick up on. Read reviews on BN and elsewhere. Sometimes notes are right there in front of you and they remain invisible until someone whispers 'rosemary' in your ear.
The question of how to continue your education and your wardrobe could be answered a dozen ways. But what I recommend is waiting until you can give a good account of what exactly you like about each frag, so that you can continue collecting with a clear sense of what you'd like more of. You've got a nice start on Guerlain, a great, classical house. Can you find a department store with a full(-ish) line of Guerlain stuff and just go there once a week and spray yourself silly?
The other thing I recommend strongly is finding a source of spices and essential oils. Don't buy 'em, just sniff 'em. Then go back to your wonderful fragrance collection and see what you can pick up.
Welcome to Basenotes. Great start!