So, here's the basics of how to make a Hobbbit terrarium.
Then, its just a matter of grabbing some potting mix and putting it all together. Start with a layer of sphagnum moss to cover the bottom of the bowl, add some gravel or pebbles for drainage, and some more sphangnum moss. Mold a hill with potting mix and furnish it with the moss, hobbit hole facade, pebbles, bunny, and toadstools. You can end up with something like this:
Anyway, Happy Birthday, bro - I had fun making this project for you and I hope you enjoy it too.