You can usually get away with ignoring the notes in brackets, they're called ghost notes.

As for the slide, take it from wherever you feel best, it just means that it's not a specific slide and its more about having movement into the note.
Quote by Mia (Pulp Fiction)
Why do we feel it's necessary to yak about bullsh*t in order to be comfortable?

That's when you know you found somebody special. When you can just shut the f*ck up for a minute, and comfortably share silence.