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We are in the process of creating a Spanish subdomain of our website. I want to know what needs to be done in regard to meta tags, sitemap.xml and robots.txt so that Google and Bing will index both website properly and not causing the web page on the English site to lost rank. Our English site is www.mydomain.com with the Spanish site being es.mydomain.com We are planning to put a button or link on both sites so that visitors can switch between both sites. The two sites are similar but not all pages are mirror images.

Wanting to use search operators such as "KEYWORD inurl:blog" to identify potential link targets, then download target url, domain and keyword into an excel file. Then use SEOTools to evaluate the urls from the list. I see the link aquisition assistant in the Moz lab, but the listed operators are limited. Appreciate any suggestions on doing this at scale, thanks!