Hey, that's the best experience someone can have for the first time, and I'd say that you took the exact amount that you should've. I'm glad that you took the time to read up about what happens, as that helps towards a good trip.
Check out www.shroomery.org if you have'nt done so, IMO it's the best source of information for anyone interested in shrooms.

Have fun with them in future man! :thumbsup: