Be careful! If you haven't already, you'd better check your state and local ordnances to be sure you are complying with any regulations.
In GA, you may keep up to 5 kids without licensure. Over 5, you have to be licensed and certified. That means inspections and all that! But, it also means you can qualify for the Federal food programs for daycare centers, which reduces your costs a little (beware of *their* regulations, though!).
Whether you are licensed or not, you need to get extra insurance in case one of the little darlings gets hurt playing on a swing or something.
If, however, you are caring for relatives (nieces, nephews, grandkids) you don't need licensure in GA. (I can only speak for GA.) Even if you go over the 5 kids limit.
Keeping 2 or 3 kids wouldn't be onerous on you, however, wouldn't cost much, and would bring in a little money.
Word of mouth advertising is probably the best way. Tell a few of the moms in your schoolkid's class that you are going to do some daycare, and the word will get spread. Make up some business cards to give out. You can print them yourself using Word or WordPerfect and Business Card stock from Office Depot OR you can go to
VistaPrints and design your own for next to nothing. I have used VistaPrints before, and they do very nice cards.
Give out the business cards to all the moms you know - give them each 6 or 8 and ask them to give them out to their friends.
Develop a Preschool curriculum - there are a bunch of resources here on FC, and on the web in general. You can download alphabets and numbers to color, other kinds of coloring pages, crafts and things to do. The homeschool websites have all kinds of stuff. Check out your local chamber of commerce and find out what's available for little kids in your area - parks, museums, activities, etc. Set aside one day every 2 or 3 weeks as a "field trip" day. You can use these as attractions for moms who call to ask about your daycare.
Good luck - and be careful!
Cheerio!
Elizabeth