Welcome to the addiction. +1 on go slow, nothing in this hobby happens fast. Their is a reefcleaners group buy going on that would be a way to add the clean up crew (cuc) cheap. Add some snails and hermits but I would wait on the shrimp. As for the salinity issue add Ro/Di water daily to account for the evaporation. What you can keep in the way of corals will be determined by the lighting on your tank. Ask as many questions as you can we will be happy to try to help.