you can actually treat your EE as CS, as long as your EE master's is from either Canada or the US. Coursera I feel is not good, since you have to wait some while for a certain of courses. Udacity seems great, but you need to pay some $$ to get their full package, esp. the lecture note.
I recommended you to use MIT opencourseware. They are good. Yup, Leetcode should be the most vital part during your preparation. If you wonder some good textbooks for some specific parts, let me know, and i can try best to help you.