Before you can receive the valuable webpage data that Webmaster Tools can provide, you must verify ownership of the website/s; you intend to monitor and study. Once you have done so, your Google account will allow you to submit (up to) one thousand URLs; including news and mobile websites.

The Webmaster Tools website data and reports, provide the best results when applied at a very basic level. Google recommends that each sub-website or sub-folder, be included as a separate entry. For example, the website has separate webpages for the different services it provides; and as such, specific sub-folders may have been created for Children, Property, and Business. If so, each of these important and relevant website page; should be submitted for verification.

To add and/or verify your website/s with Google, I recommend following these five (5) steps:

Sign into Google Webmaster Tools using your Google Account. If you do not have an account, you will have to create/verify one; before continuing.
Click Add a site, and type the URL of the website you want to add. Be certain to type the entire URL, with or without the established www. Webmaster Tools does support Internationalizing Domain Names in Applications (IDNA) when adding a website to your Google account. Simply enter your domain name in the usual manner, and it will appear correctly in Webmaster Tools. Regretfully, this only applies to the host. As such, Google recommends that you create your URL path, using only ASCII characters; that do not need escaping.
Click Continue. In a moment, the website verification page will open.
In the Name box, create a title for your website (for example, Footprints). This step is optional.
Select the verification method you desire, and follow the important instructions.
Over the past few years, there has been some Industry discussion about whether submitting a feed to Google Sitemaps (or Yahoo! Site Explorer), during verification; could be harmful to your ongoing SEO efforts. Without the sitemaps feed, a search engine will visit, index and rank your website pages, through the traditional means of established links; on and off the website. During this natural crawl of your website, a search engine will refuse to index webpages; that do not meet the algorithmic standard for inclusion. On the contrary, sitemaps may enable search engine spiders to crawl and index pages, that ordinarily may not have been included; in a natural crawl process. As such, if a webpage lacks internal/external link strength, meaningful/relevant content or any of the other notable criteria for indexing, sitemaps could encourage search engines to overlook these weaknesses; and include sub-standard webpages.
Website owners and operators should understand that successful verification does not affect their PageRank, or directly affect website performance; in Google’s organic search results. With that being said, the data received in your Webmaster Tools, from a natural crawl of your website; is incredibly valuable to improving your SEO results. However, if you choose to take the verification one step further, and submit an XML feed, the natural process of website inclusion (based on algorithm); could be lost. If a webpage is inaccessible, requires additional links, or lacks unique/relevant content, website owners and webmasters should be confidently aware; to make the necessary changes. Submitting a sitemap feed, could unduly influence the data reflected in your Webmaster Tools reports, and simply reflect quantity; not quality.