The exact directions for a good, homemade bottle of wine vary among the different kits and recipes out there, but many sources heavily emphasize keeping the process simple for beginners. The less complicated the journey, the more likely you are to reach a satisfactory (and drinkable) destination.
The winemaking process centers on fermenting fruit juice. While the prospect of crushing your own grapes may seem more romantic, it brings with it a greater risk of introducing undesired microorganisms through bruised or partially rotten fruit. To simplify this process, you can use grape juice or concentrate. Both of these products are available in forms specially designed for home winemaking efforts.
Concentrates are the best option for first-time winemakers. A variety are available and can be purchased year-round, unlike some winemaking juices. The principle behind the product is much like the concentrate you find at the grocery store. It's simply juice that's been boiled to remove a high percentage of the water. The downside to concentrate is that it's often made from lower quality juices and, as with using juices, you might have to use additives to make up for the lack of grape skins.