Can't figure this ClickBank stuff out

I have become pretty successful in the world of CPA but now I'm trying put my eggs in different baskets so to speak, and I feel like there is great opportunity for me in ClickBank. But I just can't seem to get going, I don't know if it's the products I'm picking or what. I have only ever sold 1 ClickBank product (back in late July) and I rarely even get a order form impression.

One major area I have yet to promote ClickBank is video promotion which I know might seem odd but I just feel like I would never buy a product being advertised on a cheap YouTube video. I will soon at least give the YouTube thing a try.

I try to get traffic through SEO targeting keywords related to the products, but it's hard to find tons of keywords (untapped keywords) related to all products with "buy" in them, but maybe that is all I should focus on using?

Is there any recommended ClickBank ebook I should read up on?

It very well could be the product simply doesn't sell. It also could be that you just simply don't have enough backlinks yet. Blogs get a lot of visitors almost immediately, landing pages do not without some work.

In regards to video marketing- hell, business in general- remember this cliche: It's not what you want, it's the consumer. This is so key, you have no idea. I didn't at first.

You don't need "buy" in the keywords. Just find as many good ones as you can. If you need to have a modifier on your keyword, try {cheap|free|my|store|shop}.

Look around the download section for clickbank books. A lot say the same thing, so reading like 5-10 will give you a general consensus. It's what I did.

Like this one main product I have been promoting for the past 3 weeks is a fairly high gravity product so it is selling, this product gets 15-40 hops a day for the period and I only have 2 order form impressions this whole time. Idk it just seems a bit low, and all the traffic is keyword targeted.

Is it easier in general to sell a typical clickbank product or a clickbank service like a subscription type product to a website?