Looking for a part-time nanny

We are a family of 4 and one very sweet Irish Setter. Our youngest is almost one and I am looking for someone to take care of her when I return to work part-time. Our eldest, my (step) daughter is with us roughly half the time. I will be working on-site at the University of New South Wales every Wednesday starting in December and from home Tuesdays and Thursdays, and my husband works full-time from home unless travelling. We need someone two full days per-week (around 8am-4 or 5pm). One of the full days can be split into two half days if preferred (e.g. half-day Tuesday and Thursday), however Wednesday needs to be a full day. Availability for casual babysitting is also desired.