There was a blog post about some good books to get as an artist.
https://cubebrush.co/blog/essential-art-books-for-artists
There is another book I liked called "Digital Painting Techniques" that I think is worth a buy.
https://www.amazon.com/Digital-Painting-Techniques-Practical-Masters/dp/0240521749/ref=sr_1_1?ie=UTF8&qid=1475451317&sr=8-1
As for why I chose art; well, that is an interesting story seeing how I'd be better characterized as a programmer right now. I started going to school for computer science but after awhile found it very boring and easy (I've been programming for as long as I could read); I couldn't see myself doing it for a living for the next 40+ years.
I chose art initially because it was very challenging for me. I could barely draw a stick figure. After I got better at it though, I found that I really enjoyed it as it was, and could see myself continue to do it for the next hundred years if I could.
As for knowing techniques, I watch a lot of speedpaints on YouTube. At least, a lot of the good ones (it's hard to find good ones since people post the most basic MS-Paint stuff a lot).