If you don’t have the time or energy to follow courses or teach yourself Russian from books, I suggest busuu.com. I started with it a few weeks ago, and although I haven’t really learned many new words, if you put time in it, it’s perfect for it.
You first get a vocabulary (and they pronounce it), a dialogue, a writing exercise, and in the end a small test. If you pay for it, you can also upload oral exercises. Native speakers who have an account, correct your exercises. I’ve experienced that Russian members correct them very fast.