Here are a few great resources for information put together by other organizations:
Mighty Tripod – Scripts, Scenes, Monologues, and some information about putting together an acting resume: https://mightytripod.com/resources/
Seattle Voice Academy – Tons of info about Voiceover: https://seattlevoiceacademy.com/resource-library/
I Want to be a Voice Actor – Great info on getting started in VO: https://iwanttobeavoiceactor.com/how-to-begin/
Daily Actor – How to create an acting resume: https://www.dailyactor.com/acting-resume/