1. Keep your wine out of sunlight.
2. Store it somewhere that's not very hot or cold; keep it where the temperature is consistent.
3. Keep it out of closets with strong smells that could permeate the cork, such as food, cleaning supplies, paints, and garden chemicals - unless those are your favorite flavors. For these reasons, garages and kitchens are big no-nos. And another thing, always store your wine on its side so the cork stays moist and no oxygen gets in to ruin the wine. Oxidized wines - both white and red - turn brown and taste like sherry.
As your passion increases, you may decide you need a serious storage space. Consider converting a part of a basement, pantry, extra bedroom, or walk-in closet. Keep the space at about 49 to 55 degrees Fahrenheit, with a relative humidity between 60 to 80 percent. This isn't as hard as it sounds, especially with kits, books, and professional help available - most notably Richard M. Gold's How and Why to Build a Wine Cellar. If that sounds like too much work, or you don't have the space, you can purchase a freestanding unit. These range from the size of an under-the-counter refrigerator (starting at around $380) to a prefab walk-in wine room (with prices up to $6,000).
A good rule of thumb, no matter what type of cellar you opt for: Buy twice as much space as you think you need. You'll be surprised how fast it fills up as your habit grows. A national catalog with a superb selection of cellars - and good prices - is International Wine Accessories, where you can find options for the do-it-yourselfer alongside plug-it-in-and-go models. Call (800) 527-4072 for an issue.