I think, You must learn russian alphabet and some russian words and expressions such as Hello = Здраствуйте, How do you do? - Как дела? etc. The most important and most difficult is a russian grammar, because russian is very dynamic language. Russian language haven't strict structure setneces or question such as Ebglish language: For example: English sentence: The weather is bad today=Погода плохая сегодня=Плохая погода сегодня=Сегодня плохая погода <- For 1 english sentence russian language have a 3 sentence, which absolutely identical. I think, that grammar is a most important in Russian Sorry if I have any mistakes. My English isn't good

At first, answer for yourself do you really want to speak Russian? And why do you need to speak Russian well? When you do this it will 1/3 of the way.

As another language you need to wish to lern it ;)