Luka, normally it is forbidden to employ any kid under 15. Depending when is your b-day, you may apply.
However, I would expect that for small jobs, most people will overlook it. Have a look at the local Migros or Coop, and see if baby-sitting may be requested... or go in the local bakery/newspaper/coffee shop and ask if they may require help during school break (perhaps during the week-ends?). You should not need any work permits in addition to your card... you are legally here.
Oh, and a suggestion: I don't know if Luka S****** is your real name, but I would suggest for your safety that you don't use your real identification on internet... a pseudonim would be better.
Good luck!