Advertise your sale on Craigs List and in the newspaper. There are also lots of free garage sale listing websites that people check so those are worth checking out, too. And don't forget to put up lots of signs in the neighborhood. (and take them down when you're done!)
Make your garage sale fun for your customers. Play upbeat music, offer refreshments, put together "mystery bags" for $1, be happy & energetic when greeting your customers. The longer they hang around, the more they'll buy, so make them want to stay.
If you have baby stuff left over when your sale is done, call Wear it Once, Wear it Twice in Burbank and make an appointment. They're a resale shop and you'll get decent money if your stuff is in good condition. Anything that they don't want, you can donate at any number of charities - Salvation Army, women's shelters, a different Goodwill, etc.
Good luck!!