If you don't have an established tank ready for them I'd pass on getting 100 for a new setup. You're very likely to lose a significant number of them, maybe even all, before the new tank is established. Shrimp are more sensitive to
ammonia,
nitrite, etc. than fish are, and even if they don't die immediately once the damage is done they'll die off over a few days or weeks.
All you really need is an air-driven sponge filter to keep the water circulating and provide biological filtration. If you have one from an established tank you can use that's very helpful. Sand (shallow layer) is better than gravel for a substrate because food won't get "lost" where they can't reach it. Fast-growing floating plants like duckweed are helpful for maintaining water quality.
Cherry shrimp do best in hard, alkaline water. A piece of coral or seashell in the tank will help
buffer the
pH and provide minerals for them to grow their shells.