You will need to also, decide, if you will charge per hour or a flat monthly rate. Keep in mind, that with a flat rate, they pay at the beginning of the month and REGARDLESS if they show up or not, vacations or not, sick or not, etc. Because... you are RESERVING their time-slot and your time, for them. So they pay for it... regardless if their child(ren) are there or not.
That is what is done.
That is what I did as well as most all childcare providers.
You need to make out a "contract" stipulating this/your rules/liability releases/sick policy/ etc. You can find templates online.
And have them sign it.
The general rates are $10 per hour. Low-end. Or a flat rate. But then you will have to keep track of the time/hours. AND, if parents are 'late' in picking-up their kids... then usually, care providers charge for that too... if say the person is at least 15 minutes late, in picking up their kid.
If you are babysitting, those 3 kids plus your own... then, that is a lot of kids. Really think if you can manage that.
AND... if you will be paid by check or cash. AND, that if you are NOT 'licensed" the parents CANNOT claim you/their child-care costs on their taxes.... so, how will you explain this if the parents ask?
all the best,
Susan