I will just add to the following answers from cvBon:

1. The frog should be near adult size in 5 to 6 months so you can slow down the feedings then - don't have to wait 18 months.
2. Use the 15 minute rule - as much as the frog will eat in 15 minutes.
4. Quarantine is really only necessary if you're going to put the frog in with other frogs (don't do that, please) or in a "frog room", etc. Most people quarantine frogs for about 30 days.