Yep you have all you need. Small flame will do it, in fact a very very low flame is usually all I need.
I find that consistent temperature is easy, but can be a bit of a moving target. I recirculate during the entire mash with a very small flame. Sometimes I do this with the lid off, and sometime with the lid on. It really depends on how big the grain bill is for thermal mass, what the outside temperature is, and how windy it is. Anyway, it's not hard to find the right combination of flame strength and lid combo to hold a constant temp...rarely moving more than a degree.