PPV/CPV Landing page question

Hi, now im a complete noob in in PPV/CPV marketing, I have learned alot tough but I need to ask this, for what ever niche im on will it matter that I can promote click bank products directly in PPV, as I am using media traffic and want to get direct sales, I have bought the course from Mass PPV Traffic.

What they teach is that you should create a squeeze page where you can then opt in thier names for future back end sales, they also have claims such as click bank affiliate commissions and CPA commissions

But media traffic using a dimension of 750*550

now as I was doing research on this forum alot of people has not experienced alot of success as yet, maybe because their new to it aswell.

if i promote click bank products and I know that is highly targeted for what ever niche i do as I am using keywords and urls will it convert well as I do not want to waste money,

and for CPA will it matter for the pop size dimension as I heard that the dimension size can affect the conversions when promoting CPA offers and clickbank products or any other affiliate products and networks.