My recommendation would be to create 5 new pins every day. However, with a million things to do that’s not always possible. In this case I would schedule to create 20-25 pins every weekend and post them out with gaps on Pinterest.
You can do this easily by using the “publish at a later date” option.
As you grow and get comfortable creating pins, you can increase this frequency with time. Always remember, the quality of your pins will always be more important than the quantity.