The following article is fantastic. It's not just for would-be data scientists, but for anyone looking to add value and provide actionable insights.

Advice for New and Junior Data Scientists
https://www.kdnuggets.com/2019/11/advice-new-junior-data-scientists.html

Tl;dr
Step 1: Finding Low-Risk, High-Reward Projects
Step 2: How to Generate Great Insights
Step 3: How to Get People to Act on Your Insights