Script Analysis is crucial practice for all actors, and voice actors. This is a great first step when you're first getting into the world of voice acting and want to improve your skills immediately.
I'm a completely self-made voice actor and I started from literal ground zero. I am constantly dedicating myself to the education of acting and always looking for areas that I could improve in my performance.
Amazon link to book: https://www.amazon.com/Backwards-Forwards-Technical-Manual-Reading/dp/0809311100/ref=sr_1_1?crid=LGNG52F76OED&keywords=backwards+and+forwards+by+david+ball&qid=1575910744&sprefix=backwards+and+for%2Caps%2C159&sr=8-1
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my website: www.nastasiamarquez.com
Instagram: @nastasiamarquez
Resources and references