It's up to you. There is no universal method of learning language.
Some people prefer quick start with a set of very useful phrases and borrowing new ones during conversation. It could be comfortable if you visit Russia and have an oral practice. Using such a method you can feel the language and start speaking without learning the russian grammar which could take all your time. But it has a serious drawback: concentrating on speaking patterns, people often neglect the learning the grammar and an ability to construct analogies using new words. Nevertheless most of my foreign friends prefers use this method.
I think you need to try everything and watch what method is more efficient for you.
If you like to speak, you should observe some preconditions:
1. Just listen to the native speaker, and pay attention to his/her accent, pronunciation, repeat the listening process till you are ready to speak as a native speaker. Don't think about the meaning, just pay attention to the accents and pronunciations.
Then , try to speak, and record your voice.
Then , analyze your method of speaking against that of the native speaker.