Also, I will not do anything illegal.
Thank you for replying, and I am looking forward to all of your responses. =)
Most people who try internet businesses like affiliate marketing fail, you need a reasonable skill set in order to succeed. Almost all legitimate money paying web sites require you to be 18 in order to make their contracts binding.
Warriorforum.com is a rookie friendly site about affiliate marketing that has cheap member authored tutorials, but again you probably need a supportive a prent to sign up on your behalf to something safer like Ebay or Etsy.com
Selling your game machine, etc. is probably your best chance.
Most businesses don't hire kids under 16, doing chores for neighbors including yard work, hauling out trash cans or washing windows can make a little.
Yes there are some ways using which you can make money at 15 years old. You mentioned that you saw somethings online about affiliate marketing that looks easy enough. If you find it easy, you can do that>besides that there are some other easy programs as well.
Babysitting!!! This is one of the best ways just sayin, or sell any of your stuff you don't need. It's crazy how much crap i find in my room that i have completely forgotten about.
You could mow the neighbors lawns or walk their dogs, just walk around saying "hey i need to raise some money for blah blah and was wondering if there's anything i could do for you"
Typing Service and you can look for that job online.
Teenagers who have good typing skills can offer their services to business owners who do not type well or would rather have someone else type for them. Search online on how you can get the job and where to apply.