There are many books and other resources, designed specially for writers. Some are brilliant, and some not so good. Here is a list that I have found useful over the years and would gladly recommend to any writer.

This list is far from exhaustive. If you think there is something missing off this list, then let me know. 

Books on Submissions & Writer Platforms

How to Perfect Your Submission: Tips from a Publisher
Social Media for Writers: Marketing Strategies for Building Your Audience and Selling Books
Guide to Literary Agents 2017: The Most Trusted Guide to Getting Published (Market)
Writer’s Market 2017: The Most Trusted Guide to Getting Published