In that case you , you really want do the canonical tag to avaid as such potential harm.

In my opinion this could be address by using canonical tags however, 302 redirection is never been advice for this purposes.

Here is Google guide for your batter understanding. : https://support.google.com/webmasters/answer/139066?hl=en

Yes it does provide search volume based on your selection( country wise) however, it dose not mean that the accuracy is 100%.
It can differ from slightly to a quite decent numbers. And you will have the same issue with almost every keyword tools available.
A good practice would be to get an idea from different tools ie SemRush.com, Google keyword planner.

The naked domain gives an extra room for your permalink to be more visible on SERPs thus making some extra keywords visible instead of being chopped off. So it has an SEO benefit for people who are habitual with creating long-tailed keywords inside permalinks.

If you think shorter is better, then the non-WWW approach will make you feel better. There are apparently no “technical” benefits to using the non-WWW approach, only that it reduces redundancy and is no longer needed. To be practical, it makes no drastic change whether to use a naked domain or domain with www as the sub-domain. A domain which is hosted at the root directory like www, is better remembered by people as a brand. People are habitual to recognizing websites with www extension and are observed browsing sites in address bar using the www extension most frequently.
The following advanatages you may get from it

1. Ability to restrict cookies when using multiple subdomains.

2. Using the WWW hostname allows for easy segregation in the file tructure of your website.

3. More flexibility with DNS.

   However, my preferrence is always to use WWW

You can ready further guide on this page: http://www.hyperarts.com/blog/www-vs-non-www-for-your-canonical-domain-url-which-is-best-and-why/

The reason is Moz index data is relatively small than any tools. This could be the reason. However, Moz index is getting there as they running quite big chunk of index now. Hopefully, it will not be long now

The 301 redirect indicates that a web page has been moved from point A to point B, and tells the search engines that this page “moved permanently”. It also tells the search engines that all of the attendant qualities of the original page should be assigned to the new page. This includes PageRank, page authority, traffic values, and active link information.

Webmasters should use the 301 redirect if they have changed domains, or have launched their site on a new content management system with a new URL structure. A 301 redirect will tell the search engines to direct all ranking and value signals to the new URL, and that the new URL is now permanent.

Another important note and use of a 301 is in the canonicalization of your domain. I know, big word. But, all it means is that you pick either the www or non-www version of your site and make sure to 301 to the other.

This avoids duplicate content issues/penalties with Google’s Panda algorithm. Also, if your site is using a SSL certificate, it’s important to use page sculpting of the HTTPS and HTTP versions of your site’s pages.

Hi I would say to check few things if you're not sure is the site is spam or not. Mostly, the site impression, feel and looks say it as soon as you land on any site. However, there are possiblity you still remain unsure. I personally use the Google Chrome Plugin to see if the hostname are not suspicious or some wired name. I have MOZ bar plugin again to give domain overview, it also provide me DA and PA, which helps me to understand overall where is that domain stand.

Off course, these all primary elements helps to determin the site we are going to post content or aiming to get back link is not going to harm us anyway.

It's just your sitemap index file which is showing pending??
if that is the case then, All it needs to do is addup the values of your other sitemaps (which are referenced in the index file) and show the total stats next to it.

Other than that you can submit your site to be index from GWT. See the guidelines here https://support.google.com/webmasters/answer/6259634?hl=en

Hi

In my opinion, paid directories may not be a solution for you at all. However, Frankly, we have used them but they are not as good as they say. I rather suggest you to use MOZ local to have your business on all major directories. The benfit you will get is consitant with your business information. You can access Moz local from your profile area. This will help you to improve your local seo, furthermore, you can use most of directories from their list anyway without paying any one. Most of these sites gives you opportunity to have backlink as well as reviews on your landing page.