First go through the courses available in http://bigdatauniversity.com/. It has all the courses with Labs and Videos and you can download the courses and practice it offline too. The best part is all courses are prepared by IBM. (No worries about the Quality) It has all data science courses that you can name it.

If you want to move your career to data science, this is the first baby step you should make which provides you all the fundamentals that you need. Go through the site, and let me know if it helps you.

Welcome to the journey of big data.