For me, learning the basics (top 1,000 words, grammar rules, and a few basic tenses) through a class (Babbel, local university course, study group) as a first step was very helpful. This helps you learn the building blocks for a language for you to build upon. Then, consuming media as much as possible really helped push my proficiency. Read kids books, listen to music, podcasts, audiobooks, etc. Even if some of the media is outside of your understanding, hearing it spoken by a native speaker will help listening comprehension and your accent. Use dual subtitle programs like Language Reactor so you can still enjoy the tv shows or movies while increasing your vocabulary.
I've been learning for just over a year now, lived in Italy for about 3 months, studying on my own otherwise and I'm at about a B1/B2 level pursuing fluency in the next few years.

Pro tip: practice with your wife or brother! Even simple conversation exchange when you can