Would you want me to watch your kids? is there anything wrong with this few paragraphs?

you sound very qualified, however you may want to check your spelling, grammar and punctuation. also, shorten it as it is a lot to read. organize the ad better, too. such as begin with the classes you have taken, go into the experience with kids ranging from 5 months to 14 years old, then into your personality, and how you babysit (such as with that big bag of stuff). then contact info and make sure you put a set rate on there otherwise you will be getting $5 an hour or less, while you should be getting more than twice that.