There’s plenty of online help for self-publishing authors (and other writers), even on the websites of the companies you won’t be using.
Many writers, agents and publishers are also bloggers who dispense information every day. (Michael does it, too, at www.bookmakingblog.blogspot.com.) For more, just do a search for “self-publish,” “POD,” etc.
There is some overlap, but join all three. Membership is free.
LinkedIn.com has many great resources—too many to list here. Search for such terms as writers, authors, grammar, publishing, self-publishing, e-books, print on demand, novelist, nonfiction, fiction, crime.
The Midwest Book Review has much useful and well-organized information for writers and self-publishers.
Book designer Joel Friedlander offers information, discussions and valuable advice on a wide range of topics of interest to self-publishers at www.thebookdesigner.com
Self-described curmudgeon Dick Margulis provides essays on writing, editing, typographic design, website design and publishing—based on his over 50 years’ experience. See www.ampersandvirgule.com