I agree with Digiman, just use those hang on type of filters can do, this is what i used when first started out. but since u have IOS, even better, can put carbon media (with nylon bag) inside.
if u worried, can add in those airstone old school type of skimmers (i have a few lying around).
Get few big pieces of liverock, add water, add sand (live anot not an issue, cos after cycling 1 month everything is live).
Use salt mix change water every 1-2 weeks, 10% shld be enough. DO NOT DO WATER CHANGE WHILE CYCLING TANK.
And dechlorinator additive to remove chlorine before mixing water. No need RO or DI.
Then ensure u have good lightings, can even utilise an algae scrubber inside ur IOS. I saw one bro using this to keep his nitrate in check.
After 1 month, test if parameters ok, then add in nano fishes such as gobies, clowns (skunk or ocellaris, no others), blennys etc. Tangs not advisable.
Cleanup crew can include sand star, turbo snails, hermits, shld be good to go.
Corals since the tank is small, parameters sure fluctuate and no chiller, try to keep simple n hardy ones like mushies, zoas, gsp etc.
Most importantly is got discipline to do good husbandry la. Hope this helps