"Find a good techer". I strongly believe, a good techer can help you in achieving your goals in very short span and in a right way. Of course, to find a good teacher all together is an another challenging job.
I will recommend the following
Talk to good dancers around you and ask them right questions.
From where they learned
How long they have been learning, with whom they have been learning
What to practise and what not to.
Ask them to recommend you good teacher
Listen to their Salsa story( trust me, we Salsa dancer love to tell our story.
Once you find the techer and you are on your journey of becoming Salsa dancer:
Take feedback from your fellow dancers
Take feedback from teacher
One more important point. It takes
Commitment to learn
Commitment to practice regularly
I will say the journey is tuff and rough but it ends at the most beautiful dance floor :)