If you've never done any cooking, and if you've never spent much time around a kitchen, choosing your equipment can be terribly confusing. You'll be intrigued by different colored enamels, caught by the glitter of metals, lured by wonderful, streamlined designs. But your mind may be a blank when adding up the merits of cooking utensils. It's just as easy to go haywire among pots and pans as it is in choosing china and linens. Know what you're buying before you buy. Planning is all-important.