The most efficient way to learn is to take a formal class that meets several hours a week and assigns homework. Make friends with a few native Russian speakers who want to improve their English and practice a lot. (Skype works well. ) Listen to the radio and repeat everything you hear even if you don't understand it. Watch Russian films with subtitles until you nearly have them memorized. Look up words and then write them down. And after two months you will know about two months worth of Russian which to be completely honest isn't much. But it's a good start.