When you receive SS benefits before your full retirement age (which I assume is 66 in your case), then you are only allowed to have a certain amount of other income before your SS benefits are reduced.
If you work but start receiving benefits before full retirement age, $1 in benefits will be deducted for each $2 in earnings you have above the annual limit. In 2009, the limit is $14,160.
So if you are still doing business as a sole proprietor, if your annual earnings are more than $14,160, it will result in the SS benefits you receive being reduced according to the above formula.
There is no way for you to "draw a small income" from the business. All of the income that you earn as a sole proprietor is taxable in the year it is earned, regardless of whether you actually draw that money out or leave it in the business account.
So depending on just how much your income is from your business, you may want to reconsider whether it is really worth while to take early SS benefits, as the reduced benefit would be the same payout you continue to receive from now on. If you wait until full retirement age, your annual benefit amount will be considerably higher, and at full retirement age you can continue to work and not have your benefits reduced, regardless of the amount you still earn from your business.