If you are maintaining a lease from year to year, supplemental feeding helps insure productive hunting and a healthier population. Many people feed year round, as the game ranches do. At the very latest you should start feeding on your lease by September 1. Another common mistake is to stop feeding at the end of deer season, when times are tough for the deer. Continue feeding through March, to give the animals the best chance at having a healthy wintering.
Feeders come in all flavors.
You can buy a kit for about a hundred bucks on the low end. You provide the barrel, the labor, etc. A decent mid range feeder runs about two hundred dollars. If you buy a battery, get a motorcycle battery, works just as well and half the price. A freshly charged battery will usually last all season, but not all year.