Affiliate Marketing Secrets

In which area is there a gap market for health and fitness clubs because I need to know for my coursework. I’m launching a new health and fitness club in a new location. Could anyone help me?

Supposedly a website with a niche makes the best money.
My site isn’t focused on one particular topic though, instead it’s focused on many.
I have about 60 main topics that I’ve narrowed down as far as I could to represent main topics in life [aging, humans, quantum physics, animals, health and fitness, etc]
and within each topic I have a list of subtopics that build the main topic.
My site is designed by me and it’s made to look nice and easy to read and navigate.
I have adsense on every page and i’ve included affiliate links on a few pages and am building as the days go by.
Since the amount of topics I have lacks enough content for the time being, i haven’t driven any traffic yet. I haven’t offered my site for people to view yet..
So currently the most i’ve made is $0.89 through adsense and that’s from 2 clicks from 2 random visitors that i’m not sure how they found my site or if it was bots somehow.
But i’m wondering, are niche websites REALLY the best?
Is a website that has a ton of information on anything you can imagine something a person should stray away from?
So far I have months of hours put into this website. I rarely sleep, i’m always at the screen. I don’t watch tv or play games I simply work on my website to make it as best as I can and making it cross-browser compatible with jquery, css, php..
What do you think? Good idea? bad idea?
Do niche websites really get more traffic or does it all depend on how I traffic my website?

i have various DVD’s in IFO, BUP, and VOB file format. think of a film and the film is made up of these formats. now i want to convert the film from these formats into 1 AVI file how do i do that? the software you tell me about has to be totally free to use, no trial versions or me have to buy some expensive piece of software … im broke.
the reason i need this information is once i can convert the files (without losing sound or picture quality) i can then sell copies of the DVD’s (there in the health and fitness niche).
all help will be most appreciated