yea just go step by step. just hook up the sump with a return pump and setup a refugium inside the sump and if you want cheap lighting for corals, you could look into a few t5s.... but from what ive heard leds are better way to go as you don't have to replace the bulbs and they normally work better with lps
apparently and use less electricity.... the sound a lot better but they are normally a lot more expensive than t5s.
and just buy some live rock and substrate and AWAYYYY YOU GOOOO!!!
then just start slowly upgrading from there... like a bigger sump.... better lighting.... more filtration (skimmer/uv
sterilizer/reactors, etc) if you really want to