If you are making pizza, then a pizza stone would be a good idea. I would remove the heat deflector so the stone absorbs the heat, this will give you the crispy base you are after. Run the Kamado as hot as possible.
For Low & Slow, use the minion method for the Charcoal. Vents open, then as the Kamado starts to come up in temperature start closing them down. Top vent can be set to 1/4 open. Remember it is easier to raise the temperature, than to reduce it if you have over shot your desired temperature. I always say, if you have a new piece of kit, play with it a couple of times, without food, to seen how it controls. You will after time, find where the vents need to be set for a Low & Slow Cook.