Currently, I am working on just one niche. Is it all right if I add 4 to 5 more niches simultaneously and start working on them? I am planning to do it from March. Or, should I concentrate on one niche at a time and add others - one by one - after a few months?
What would be the best approach?
And, how many minimum books should be availabe on Clickbank for a single niche? What if there are only 2 books available and both of them have an opt-in form? Should I still beat the drum for them?