Hello,
I have read your requirement clearly and checked your reference site given by you in your bid description, I have developed many wordpress sites for my client and I am having 4+ years of experience in wordpress and web development, please check below questions with my answers :-
Q:1 How many ads should i place on the home page for optimizing CPC?
ANS: We can apply header, left navigation, right navigation, 1-2 ads in body and one ad in footer we can add for Cost Per Click.
Q:2 The three best converting ad sizes?
ANS:
Q:3 1 popular method to increase ctr?
ANS : By using keywords and extending headline.
Q:4 How many characters an seo article must have (minimum)?
ANS: approx 400 characters.
Q:5 The appropriate keyword density ?
ANS: keyword density means the popularity of keyword using for SEO.
Q:6 And last but not least, when traffic is coming in from social media i need to display 728x90 banner in the header because it is above the ................?
ANS: Header and navigations.
Thanks,