Hi.
There are so many little details about beginning a reef tank that it's impossible to put it all in one post. My advice would be to read a few threads written by first timers. There will be many discussions about the more common issues faced in reefing. Also some of the more popular YouTube channels, such as BRS have decent set up guides and can also guide you through individual aspects of reefing.
You really should have a solid plan for the tank's evolution, from first fill to adding livestock, before you throw anything in.
What else have you done in this last eleven days? What is your filtration set up? What lights do you have and how high are they mounted above the water?
All these details help people here give advice based on what you have and what you are likely able to achieve.