Affiliate Marketing Secrets

I am 14 years old. Me and a friend are very interested in stocks. We want to spend some years researching the ins and outs of investing, and then start investing maybe when we are 15 in a few months or 16. I realize that our legal guardians are supposed to open a custodian account for us. Where would I go to open this? Also, could someone just explain some simple things to me very very briefly, like NASDAQ and DOW? Im reading a bunch of books, and I would just like to increase my vocab. Thanks!