There are several self teaching methods:
Michel Thomas Method - best one for me,
Pimsleur,
Assimil,
Teach Youself,
Berlitz.

Check out recomendations of Alexander Argüelles (Profasar on YouTube).

And see the Langfocus channel on YouTube just for fun.

just start;)

Use the speak easy app. Its only like 10 dollars but has lots of vocabulary and phrases and flashcards as an option.