Welcome to R2R!!!
As already stated, Live Aquaria is a good website to go to for quick facts on various species of fish and inverts.
Also, for inverts, specifically Clean Up Crew, you can go to the Reef Cleaners website to purchase one of their cleaner packages.
https://reefcleaners.org/aquarium-store/cleaner-packages-with-free-shipping
Otherwise, if you have specific questions about one species or another, just ask here and I am sure someone will answer you.
But some general rules
1) Damsels can be aggressive, some extremely so.
2) Basslets will be territorial with each other, but with a tank that size you should have plenty of room for a few to be happy.
3) Dottybacks are fairly aggressive, almost as bad as damsels
4) some wrasse species will be aggressive to all other wrasse species, so it is best to consult the following thread if you want more than one wrasse species
Introduction My name is Hunter and I am a wrasse addict. Admitting such is the first step to buying another wrasse, I think. Wrasses are not only my passion, but my niche in this hobby since 2010. My tank is full of them, and unfortunately “regular” species are no longer exciting enough for...
www.reef2reef.com
5) you will at some point get hitchhikers, some of which have natural control methods, as in other animals that are reef safe and will eat the unwanted pests. For instance, wrasses will eat worms, and other small pests. Likewise, Peppermint Shrimp will eat the much maligned Aiptasia Anemones that come into your tank. However, some of these animals might also snack on your corals or CUC, so choose your natural control critters wisely.