You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
If you ever have tried to figure out how many coals to use on top or the bottom, or how many coals to use for a certqin temp, then here's a greta guide. This link even has a calculator to determine how many coals to place depending on how you're cooking. Check it out, it's a great link for DO cooking information.