If you need help with finding the 1 when you're listening to the salsa rhythm, practice listening to this song.
Count out loud when you watch the video... Then look away from the screen and listen. Test your self, and see if you are getting it.
Pay attention to what instruments make a sound on which number, and what patterns repeat themselves.
Getting used to the salsa rhythm takes time, and it's something that gets better with practice!
Song: Royalty Free Salsa Music