dig and level the patch of ground that the barbecue will sit on. before pouring the concrete make sure that all your water, power and gas lines are laid, because it will be hard to get them in there after it is poured. run all connections through the foundation and cap them. ours was 3'x11'. create a form to pour the concrete in from 2x4's. mix concrete according to the directions on the package. pour into the mold. level and smooth the concrete with another 2x4. it would be easiest to rent/borrow a cement mixer because we will be mixing a lot of them.