Babysitter/Before-After School Care Needed For 1 Child, 1 Infant

In need of a sitter for a varying schedule with my 6yo daughter and 1yo son. Typically would be every other Sunday from 6:30a - 4:30p and then potentially one or two other days from Mon-Wed. Schedule will be varying for the first month, then will be known 6+ weeks in advance. 6yo needs help getting to the bus stop and picked up from school/bus stop. 1yo needs standard care with naps in morning and afternoon. Currently taking whole milk and solid foods, learning to walk. Looking for CPR/first aid training and someone who is comfortable with infant/toddlers and a relatively varied schedule.