Hi Patrick, better to read up on the sticky thread which will give you information which will save you hassle and $$$.
What are you intent to keep? Fishes (fowl) or Reef (Fishes with Corals)?
Important note: your tank are small, any change in parameter will affect the Live Stocks (LS)
If fishes, then good to get some live rocks. They do contained bacteria, pods, hitch hikers(need to be careful).
Dosing bacteria (try to measure it with your water size in Liters or Gallons). Too much will caused problem to your water.
Check that skimmers are working as small tank, skimmers is the upmost important to filter away any unwanted stuff.
Do place a dead market prawn so that it will give u ammonia spike, then it will turn to NO2 then NO3. Need a test kits to verify.
Patient is the most important in Reefing. Not forgetting good husbandry like change water etc.
I did start off with no knowledge and spent a lot of $$$ wasted. Equipment is important and get a good one so that you don't hav to waste all the effort building and then see something happened to the LS.
Good luck and happy Reefing.