Noone mentioned selling adderall. That is the easiest and best thing to sell when you have a prescription. Go to the doctor and get prescribed mad of that shit and sell it all. I doubt you can get xanax too but if you can thats even more money.
THis might not work in Florida due to like minded people but going around your neighborhood on trash night and collecting cans can work well.
Do you have a good connection for alcohol? IF you have someone to buy it for you you can profit off kids very easily.
Cigarette idea is good but schools can be gay my HS would give out suspensions if you sold smokes depends on the school.
Offering rides for $ to kids without cars and younger kids can work. It can be anywhere just let as many people know as possible you'll give lifts for 5-10 dollars. If its nearby in your town and your parents buy your gas it won't matter what you charge peeps it will be profit. 14-15-16 will pay that kind of small money for rides.
Stealing- you want to pick your spots here. If you want to rob someone for drugs (and its not a close boy) make sure they are a bitch and won't cause you big problems. Robbing kids who go to another school is always preferable. In my day graphic calculators were the thing to steal nowadays I am sure its smart phones. Kids will be idiots with their phones just pocket any you can and sell it on ebay. Raiding the lockers of kids in gym class is good. Unlocked bikes are good and easy to steal if you have somewhere to sell it but you might not be able to sell a bike you steal from another kid easily. And good luck bringing bolt cutters to school.
That dudes book idea was pretty good if you do the right legwork and locate a book that you can flip online for 20ish bucks and steal one every day from a class they are kept in.
Another idea is to try and do something like a walk for hunger or charity run and collect donations from people and just pocket them.
I haven't done any of the shit I listed above btw other than sell adderal. In middleschool I sold a few playboys at a hefty profit though but noone will pay for that after age 11.
Being broke is NEVER an option bro start hustling. Use the no green card thing to your advantage to sharpen some entrepreneurial skills at a young age.