Well, hmm, I don't have the script in front of me, so let me start with what I know, and we'll work backwards.
There are two types of hot glue, one melts at a much lower temperature than the other. The lower temperature version is the one you'll want to use.
You know you need a unicorn. In my mind, I'm picturing this unicorn laying down with his legs tucked close to him (ok, so maybe unicorns don't lay down, but unicorns don't exist, so work with me.) . .at least he's not standing on all fours. So you'll want to start with a steady hand and lay down the first layer of hot glue on a surface that he'll either pop off of or you can scrape him off fairly easily once he's done. Begin with the outline and just lay down one ring of hot glue in that outline, and let it cool. Lay your next ring right on top of it once it has cooled a bit, and just create a hollow unicorn. I know this doesn't sound easy, but you can always go back with an exacto knife to cut in some details. I'd suggest researching glass animals, find one you like, and try to get as close to it as possible.
Oh, make a butterfly. That's easy. A bird would be fairly easy too. I would just avoid anything that actually has to stand on four legs. If you can sculpt it so that it's laying down, you'd be saving yourself a bunch of time. Am I making sense? If not, PM me and we can talk further.
By the way, I've made Candles, wands, pottery, vines, goblets, and similar items out of hot glue. Really.
