I'm not sure what you mean by sustainable, but it is against the law, in most states, for someone under 18 to have a full time job, even the hours of the day they can work are limited.
I have not seen any information about serious employment for 14-15 year olds in Buffalo; Does anyone know where I might find serious employment? By serious employment I mean a job with sustainable income, nothing like a lemonade stand or babysitting.
Most places cannot hire those under 16 because of child labor laws. Talk to your school conselor about getting a work permit and what job options you may have in your area. I am thinking a grocery store bagger might be an option.
Legality aside, I suspect the reason you "have not seen any information about serious employment for 14-15 year olds in Buffalo" is that employers generally do not look at 14-15 year olds as serious employees.
You may well be the exception, but you will most likely have to do some serious investigation to find a demand for your services.