You may get more answers by being more specific about the type of anemone you want to get. Some require more light than others.
If you're just starting this tank, then there's preparations in things like the rockscaping you can do that will be beneficial to your nem. The type of anemone you choose may affect the types of livestock you place in your tank as well, like the types of clowns you get. Or, the type of clowns you want may affect the type of anemone you get.
Anemone type can also affect the placing and types of corals you're willing to put in the tank, and the order in which you stock your tank.
I have a 75 I'm waiting to get to the safe point for adding an anemone. I'm going with the 6 month waiting rule. I know I want a rose bta, and I know I want black occel's. I already know that these clowns may not host this anemone and if I wanted to see hosting behavior I'd be better off changing one of those out so I have a more compatible combination. Luckily I have a pair of clowns hosting an anemone in a different tank so it won't be the end of the world if this pairing doesn't work out.
I'm also holding off on putting a lot of corals into the tank before the nem so it doesn't kill anything off if it moves a bit to find a happy place
There's a lot of planning that goes into things like this, and I want to thank you for planning things out a head of time, this way you can provide the best home possible for the animals you are taking stewardship of.
Good luck!