Patience is the key in this hobby. Rushing can only cause suffering, both to your livestock, parameters, wallet and morale
Damsels can be nasty fish and I'll always avoid them (well bar a pair of clown fish). If you want a peaceful reef then i would recommend taking them out or at the minimum add near the end once the more docile fish have been added and got themselves accustomed/settled to the tank
Keep testing the water and continue to research the corals you would like including their requirements (placement, lighting, water flow etc) and whether any fish you want may take a liking to them (eat/nibble them).
My tank is 13 weeks old and I only start adding the hardier corals after 6-7 weeks, knowing for a fact that my parameters were spot on even after adding a few fish. I started with a GSP isolated on an island rock.
In that time you can decide on what type of corals you would like (Softies, LPS and or SPS) as each come with differing challenges for example dosing alk, calc and mag plus the possibility of target feeding.
Good luck and happy reefing