Found a niche, how should I advertise?

Last night I was working with a friend, and I came up with an amazing idea.

So when I got home I immediatly searched for competators, and I found one in my own country.. And his one pretty much sucks.

International I haven't found any yet, the keywords are used pretty often though. But not in the same meaning. I will try to advertise through social media + youtube I think.

Target audience;
12-25
Area; Not exactly whitehat, but not black hat. I'm just pissing some people off.
Payment;
Sharecash, they will fill in a survey through sharecash. And then they think they will receive something, which they don't. Can't tell more =D

How should I advertise this?

Maybe I should invest in this?

tweet attack 70$
Proxys 40$
hosting 30$?

Search is your friend, try this thread.

Found a niche, what do I do?
http://www.blackhatworld.com/blackhat-seo/black-hat-seo/306842-found-niche-what-do-i-do.html