Overflow box by a company like eshopps and a solid dc return pump would get you going. Fuge in the bottom, no need to get a skimmer imo.
Diy kits on ebay or by fiji cube or egg crate lol.
As far as fish stocking. Stick to 3, 2 clowns and a watchman or other pistol companion.
For inverts, a cleaner or peppermint shrimp, Sexy shrimp, pistol shrimp, and porcelain crab would be cool.
CUC, urchin like a tuxedo or halloween. Snails, hermits, etc. Maybe a small conch if you do a deep sand bed?
If HOB, a single Aquaclear 50 or 2 would work fine. Bubble magus qq1 was an excellent skimmer for this tank.
Coral wise, you need some that can handle the sting of a nem like a toadstool leather. dont know of any others but there is quite a variety of toadstools out there.
Here is a photo of my 29g on a Eshopps RS75 sump, using the HOB overflow. Tying in my 20 gal this week using the Fiji Cube 12.
My lighting option is the Glowrium Reef Light from amazon, a little over $100 with prime. I have a thread on these if you want to learn more. 30-36" model.
Once it clears up...