Can take up to a year to fill all spaces with quality client who good match. If you are going to take just anyone who want space, then less time.

Start advertising now. This allow you some time to be selective. Most parent will want to see space so sooner that set up better.

Use any advertising available. FB groups for day homes, FB friends to share information, Kijiji, mail box flyer, notices in doctors office or grocery store notice boards. Anything and everything that permits adverts where young families go and will see it. Getting known in neighborhood biggest advantage so you are first name people think of when new parent looking for care.