One of the blogs to which I subscribe is from Potomac Indexing. The post from 15 November 2016 is particularly pertinent for indexers just starting out (but for all of us as well)–I’d really recommend a subscription to this blog.
The post on Setting Boundaries with Clients addresses an issue that all of us need to consider–and which can be difficult when you are trying to start you freelance business.
As a bonus there’s also a link to some good articles from Northern Editorial on setting up and managing a freelance business.