An occasional sub? I have had an ad posted on kijiji forever, and yet still no bites (well desirable ones)

I'm at that point in life that I love my job, but would rather not work 55 hours a week. I'd love someone every Friday, for a week-long holiday, 5 hours a day in the summer so I can easily go on field trips, maybe someone to just be here when I don't wanna get up in the morning

Where should I advertise and who should I direct my ads at? What is a desirable pay amount? Which qualifications are 'must-haves'?

Ideally I'd love an experienced preschool teacher, and yet I've found they think dayhome is the bottom of the barrel (from first-aid courses). What do they make an hour?

I live in Calgary if that's any help.