The timing of your post (2.28am, Britih Summer Time) and the price of an air ticket to Ireland strongly suggest that you're in the USA. This website is based in the UK, so what's possible for teenagers to do here might be very different to where you live. (There are loads of rules about young people, of school age, being employed here).
However (other than what you've already suggested) British teenagers would probably be seeking part-time work (within the strict restrictions which apply) delivering newspapers, sweeping-up in hairdressing salons, helping out in convenience stores or on market stalls but some less obvious money-making routes might also be available. (When I was 14, I made some money from writing sports reports for a local newspaper, for example).
Perhaps you might get more suggestions by posting on a US-based website, such as one of these?
https://answers.yahoo.com/
http://www.answerbag.com/
Good luck!