Should I put a mark say about 1000 words to accept the guest posts in my blog? Does it really helps to create insightful content?

I having a huge blast of traffic in my mobile version of my site. But the conversions from it less then 1%. Should I build an app to get needle moving? Have anyone faced this problem before?

Suppose, I have created a 301 redirect in my site. So, how long do I have to keep it in order to keep my ranking same as before?

How can I attract more and more advertisers to my site? So, I can make more money. I am not saying that I am doing it for the first time. I already have a few advertisers and I have got a pretty decent traffic with ascending rate.

SEO Yoast plugin is creating a problem for my keyword count. It is kept on saying that I don't have enough keyword in the first para and meta description. But what I am seeing that there are already plenty and if I add more then it will get keyword stuffed. What should I do??

What is the number of outbound links from one post suppose if has 1000 words in it? So,that the links should look all natural to the search engines and not led to any manual action penalty.

What are the basic elements to make a site only for Amazon products?

Does the private blog networks still work in 2016?

How to target the right kind of audience if Facebook? All I see is that a whole bunch of random mass. How to effectively filter them?

If I want to start a forum. Then what are the basic steps that I should follow to make it grow? I know that forum communities are a lot different from blogs and they are pretty tough to get traffic to them. But every forum starts from scratch first, right? So what should I do?