Consider whether you will work nights, weekends, but do allow one or two evenings for you and your family, with no other children. Fixing an hourly rate can be the hardest. Don't be afraid to call daycare providers and ask what they charge. You don't want to price yourself higher than the local average, or lower. Decide if the rate you charge will include meals, snacks, field trips etc.
Advertising is probably the easiest task.
A classified ad detailing your hours and rates will generate a fair amount of interest, as will ads placed in grocery stores and other local family orientated businesses. You will need to make arrangements with another provider or two to cover for you if something should happen and you are unable to care for children. It will happen, no matter how well prepared you are, so plan ahead. Now that you are ready to start caring for children, good luck and congratulations, you have entered the world of being a business owner, enjoy yourself. It is a low startup cost business that has many benefits, find out how to start one of your own.