Writer Resources
As a first time author, I relied a LOT on advice posted online by other authors, so I thought the least I could do is return the favor!
Here are some resources that might be helpful to you if you’re writing/publishing your first book:

Writing in General
The Glory of the Sequel
Middle books are not “filler” - they're an opportunity for fulfillment!
Self-Publishing
Formatting Woes - Part 1
I figured out the hard stuff so you don't have to! Part 1: print books