"Step 1: Learn/Read/Practice
You decide decide where you want to start among these and be open and honest with you.
Maths/Stats/Prob- don't expect every thing but what is required to do and complete DS projects,
I am professor with Ph.D/ M Tech/M S/B.E having academic, teaching , research (Computer Science and Engineering) and administrative experiences (32 yrs) . Data Science enthusiast working hard towards to become Data Scientist .