Yes. Stealing is wrong, no matter how old you are and you can always get in serious trouble for it.
Yes
i do not no
Yes.
no its illegal
You have to be thirteen years old.
yes, they can be left alone if the twelve year old is be responsible, if they are not responsible then hire a babysitter for not only the 2 year old but also the twelve year old so that you can embarrass that twelve year old. (inviting over their friends while having the babysitter might just do the trick) and make sure the babysitter is very unattractive and old.
no that is illegal
NO, because that 12 year old is too young.
An 18 year old is considered an adult and should be more than adequate for child care. You will want to insure that there is a medical consent form for the babysitter and all your contact information.
Yes, they can be charged with assault. They may even be charged as an adult.
you can be the age of 15 and up
Just have a note that your 12 and that you will do it if they are younger not the same age