Important advice for this babysitting job?

hey alll you baby sitters out there!
I am babysitting this morning...there are four of them, a boy who is 10, a girl who is 8, a boy who is 5, and a toddler who is 2... Please give me any important advice for babysitting this family as I have only babysat my own family not others.. the mom completely trusts me and I know the kids very welll

Please give important advice...HELP

ok well make sure they don't get into trouble 2 much maybe the 10 year old can help you I babysat before a girl that was 8 and her sis was 4 and the baby she was 10 months old its hard but its a good job keep a eye on them make sure they don't get into trouble,like streets,walk with them play with them and have fun but be also strict tell them not to do that if there doing somthing wrong if you don'r do that they can think they can get away with anything so good luck if you need 2 ask me anything funmail me peace xxx

-pookabear-

I would just all keep them in one room and entertain them for awhile so I can keep my eye on them :X

But the major headache came for me when I had to babysit this 7 year-old for 8 hours and he WOULD NOT STOP TALKING :[