I am running a 80g tank. Be it only for three months.
I have no sump, just skimmer and fluval 304, with 4 power heads, 40 kg of coral.
The lighting I have been advised to go for is 2* 150 watt metal halides.
This will aid coral growth plus give the shimmer off the water.
I have 2 damsels, 2 clown fish, 1 yellow tang, 2 cleaner shrimp. All are introduced as baby's (being small they cause a lower bio-loading when introduced) (Had no deaths).
I think the biggest issue to watch for in a cheap setup like this without sump and fancy equipment is understanding the limitations of the setup.
I have my max fish load, and aim to keep simple corals and an anemone.
Another thing which I think is the hardest is patience. I added all my fish and shrimps individually over two months. I take twice the time to release them into the tank than the shop said.
Good luck.
I'm still reading and learning all the time. This forum is great in getting good advice.