When I started doing this I was doing it in a blues context.
I would start on the G string 9th fret or the E note
Next play the B string 8th fret or G note
Stay on B, slide up to or pick the 10th fret or A. Now bend it up a full note, release it back down the slide to the 13th fret or C note. Hold it keep it ringing.
When you can do that slide from A to C and bend C up a full note or what you can do, keeping it ringing.
You may want to start by just playing A sliding up to C then slide back down to A with it still ringing.
Watch the players right hands you will surprised how much you learn.