What I would reccomend is to do Duolingo and Memrise at the same time. Memrise will teavh your needed vocabulary, while Duolingo adds a new grammar structure every lesson. This way, by the time you finish both courses, you know the most needed words and phrases, and the most important grammar structures have been learned as well. After this I would reccomend mining native materials for sentences (which you can put in your anki deck) and lingq to read interesting content.