One of the nice simple methods of controlling heat if you are using pans ect is to cut two beer can thickness logs around a foot long.... Place them about 8" appart with the ends pointing towards the fire.
Simply scrape out some ashes from the fire and channel between the logs half filling, but getting less towards the outside ends. The logs then become pot stands and you move the pan up or down the log depending on heat required. It also dry's your logs for later.
al.