You're in high school? In that case, I wouldn't suggest going into this line of work. First of all, if you can't answer the questions you asked (do I charge more for multiple kids? Ummm.....YES!), you shouldn't try to do this, but the main reason is that you are on the hook if a kid gets hurt, or heaven forbid, dies while one of your sitters is there. Too much legal stuff for a high school student to try to handle. I'd look elsewhere for a real job.
Yes doctor, I am sick.
Sick of those who are spineless.
Sick of those who feel self-entitled.
Sick of those who are hypocrites.
Yes doctor, an army is forming.
Yes doctor, there will be a war.
Yes doctor, there will be blood.....