There are several good options depending upon your talents and time.
1. Lawn care - Starting a small lawn care company is easy, just requiring the purchase of a quality lawnmower ($250), a weed-eater ($125), and a leaf blower ($125). For this price, you can buy quality equipment that will not require a great deal of maintenance. At $50 and up per yard per week, your investment will be returned quickly. Growth is easy as well, especially as more yards are accrued and other opportunities are available, including mulching, aeration, and leaf collection.
2. PC repair - If you have a knack for technology, a great deal of money can be earned for repair and consultation. Companies inside big box stores can charge an arm and a leg for mindless repairs, so by undercutting them, you can still make a large profit yet save consumers money.
3. Painting - Home painting is an activity that many people hate to do; therefore, it is an excellent job opportunity. Painting is simple enough and requires little start-up cost. In addition, painting demands a high price, so your meticulous work will be rewarded. In addition, as you perfect you craft, more in-depth projects will demand a higher profit.