Enough visitors but the site is not making much money?

I want to clean up an email list of mine. It has bounces around 5%. Any good services that do it and also for yahoo emails.

We are looking for any good services who can optimized our site according to the mobile devices. Any suggestions?

How time does it take to get a backlink indexed?

Non-existent pages are generating 404 error pages. How to fix this?

Schema markup of a small blog, how much time does it take to update?

Making services cheap, how does that work for you? I mean did you get more sales?

The best way to learn about PPC Campaigns? Are there any good tutorials or blog present.

I am new to affiliate marketing, So, I am having some dilemmas. Should I promote low risk E-Mail/Zip submit offers or go for Pay per sale offers? What are your suggestions?

How to use #hashtags effectively? Does anybody has any clue?