How much cured LR
did you get?
How long has it been in the tank?
Have you fed the tank (e.g. pinch of flake food) since getting the LR
ASSUMING you have 90-120 pounds of LR
that has been in your tank for less than week, and was out of water for less than a few hours, then you may have a cycled tank. That assumption needs to be tested. A SMALL cocktail shrimp should show a very small (negligible) rise in ammonia, then nitrite, then nitrate if any at all. A couple pinches of flake food could be substituted. If you see no rise over the course of a week you should be able to start adding livestock.
That would mean that you can setup your QT tank now. Get a sponge filter or biowheel etc. and put it in the main tank to get the bacteria growing there. You should leave it there for a week and make sure the tank is fed (a pinch of flake food every 3 days). After a week you can complete the QT tank setup with the filter and add your first fish. Just add 1 or at most 2 fish a month till you reach your max. You can add a clean up crew (inverts) as soon as you know the tank is cycled.