I wrote a hub on that (basically on my 200th hub, I wrote about my successes, what I did right & what I did wrong).
I say if you're just putting things down in hopes of making money, you might be wasting your time. If you love your topic or writing you'll have a better chance of succeeding because you'll put in the effort required to do outstanding work.
A niche really helped me.
Look at HP suggestions for making a hub great, make corrections, update occasionally, make sure links are working, etc.