I neeeeeeeeeed help :)?

ok so, im going to Florida in march i think, or maybe feburary, and iwant to lose 15 pounds or more, but im only in 8th grade so any lunch menu that i can take to school? exersizes? snacks, and what are good things to eat for dinner that my whole family can enjoy, and do Lean meals work? please no noncence answers thanks :)