A large number of the world's most successful people point to books and reading as a big driver of their success. Warren Buffett, for example, reportedly reads 500 pages a day.
You can take recommendations from the very best people in your field of career or from Google. If you'd like to keep your load light, you can invest in an e-book application or device; read as you feel - maybe a page a day, and then slowly bump up your capacity.
If it really is not your thing, we recommend looking up Audible or audio books (here is an example of a free resource).
Bonus tip: Books can be inspiring and insightful, so keep a pen and paper next to you if you'd like to take notes. You can return to that later on and use it however you please!