yes cherry shrimp are best for this project.
good plan. let it grow for a month or until the plants fill in. you can even do a dry start if you want faster results.
Some people say that our bowls start to look ugly when they're all greened out, but I have to disagree. there is a good purpose for greening out a bowl - maximum oxygen production, maximum filtration by the plants, and some good foraging area, especially if there is moss in the bowl.
usually the more plants you can grow in that thing, the better for your shrimp.
once you fill it, you'll want to wait a while for the plants to grow into the substrate and stabilize it, so that it is not easily upset. at the beginning you will find that the cap layer is easily moved around if you pour water into the bowl. you have to pour water slowly and carefully to avoid messing up the substrate. the same goes for trying to plant things early. the soil will just get messed up. after a while though the plant roots will help stabilize it and you can then try very carefully planting other things.
good luck!