Hi welcome to the reefing club.
Firstly , i think you need to plan your budget you willing to spend for starting up this hobby.
Then next step you can look for the tank that suit your budget.
As bigger the tank , the higher the amount you need to spend. etc equipment & the amount of fish , corals , live rocks & live sand.
But bigger the tank , the easier to maintain the parameters.
so i feel u better have a plan first so we can help you along the way.
Most important, Happy Reefing