I've never used corn meal, so I have no idea why it's in there. But, you'd need to do a mash if you're using it. You'd have to add some base grains in an equal amount and mash it at 153 for about 45 minutes in 1.25 quarts of water (at 153). I'd try something else if you're a beginner and don't know what the corn meal will bring to the recipe. It should lighten the body, and provide no flavor.