Most companies that hire for search engine evaluation have multiple projects available to work on, so the exact work you do might vary. However, search engine evaluation in the traditional sense involves analyzing queries that regular people like you and me might type into Google or Bing search and then determining the best possible results to match up to that query so that users have the best experience possible using a search engine.
Bloggers are typically people who enjoy a particular topic and enjoy writing about it on a semi-regular to regular basis. If you have something you are passionate about, or are an expert in a particular area, you can consider starting a blog. Blogs are a great way to: teach people about a particular skill, entertain, or share about life experiences.