I'm 14 year old with $300

First thing i will do, i would not ask anyone.
but since u have asked, here you go -
1. take a look at BHW BST, try to understand what is going on there.
2. go on fiverr.com, look at top rated sellers there.
3. go to elance, odesk look there what is happening.

Now think of your skills. You want to provide a service for making quick buck OR u want to learn something.
If you want to learn something, bhw has lots of cool tutorials. Try to understand yourself.
You want to go in programming feild/designing field/seo field or what? learn stuffs.

And most imp. thing "stop asking like this"
asking will stop you FROM GROWING.

In any case, I'd automate my earnings to have more time for my studying.

SEO is one of the best option, organic traffic is always automated if you do it right.

Make a few sites with low competitive keywords.

If you do keyword research properly, you can easily make a few $10+/day sites.

Don't hurry to invest your money, read every single method out here, you'll be sorry if you find a good one after spending all of your money.

Do not spend first month's incomes for fun, turn it into business again and you'll make 10 times more than before.

Best of luck.

P.S Don't let that money surprise you too much, the main thing you should focus on right now is your education, even if you have to drop IM, money can wait.

Alright guys, I'm definitely going to be making 3-5 cpa videos on youtube and seeing how that goes, it's just all the top affiliate websites usually require phone verification. I have no problem talking to them, I just don't see them giving a "kid" access to their website.

To Aftershock: I really don't want to use "get rich quick" methods, I want to build a business as you stated. If anything, building a small business at my age will be a great learning experience. I'm going to be taking action and making these videos tonight if I can find a decent affiliate site.

Ridiculous statement, just because you didn't start at 14 doesn't mean he can't.

Mr.Whitehat said:

lol dont u want to study at all? too young though part time on im is kinda ok

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right im not sure the prices in schools in the us but
when i was in school in little old england i used to sell cans of coke from my locker, buy in bulk for 20p and sell for 50p each
your still doubling your money.

Invest in domains and park em'.