Lay a long sheet of cardboard down across the table to function as some added padding. If you don't have a single sheet that properly fits the table, use multiple pieces of cardboard and line them up next to each other.
Drape a tablecloth across the pool table. One tablecloth is not likely to cover the entire table, so you will probably need a second one to keep the entire table protected from dirt and dust. You can either sew the tablecloths together to form a one-piece cover, or you can simply have each tablecloth cover one-half of the table and have them meet in the middle.
Unzip sleeping bags if you don't have tablecloths available or if you want additional padding for the table. The unzipped bags will form large, padded sheets that can be used to protect the table surface from damage.