Fill the fire ring with lump charcoal (Kingsford won't work) lighting with firestarter cubes (weber sales them) in a couple fo spots. You need to use a pan or a plate setter if they have one to make it indirect.
You control the pit temp with the bottom vent and the exhaust, bottom vent maybe only open 1/8 to 1/4" and the top vent will closed to 1/2" . Use very little wood for smoke for that reason.
Because it is ceramic once the pit temps get too high it is very hard to get them back down. If you would like to call me it would be much easier to talk you throught it rather than write it.
I can vouch for all that. I had to teach a guy how smoke on one of these and had never previously used one. Wish I knew about the pan.