You should start learning by either Python or R programming language.
You must go through this Python for Data Science tutorial :
After that, you should learn the basics of statistics from the below tutorial:
and finally, you should learn Machine Learning Algorithms.
For learning Machine Learning Algorithms you must watch this comprehensive tutorial:
For getting a job as a Data Scientist you should be a professional in Data Science and you need to have a certificate for proving it, so, you should go for Data Science courses to make your career rise to the next level.
Hope this answer helps!