Well, I'm very new to playing the guitar and I'm just trying to play Stairway. My question is this.

When the tab reads something like this:

---0----/8----7----

I read that as playing a 0, then sliding to an 8.

My question is how am I supposed to slide if I'm not holding anything down in the first place? How exactly do I play that. Right now, I'm just plucking the "0", then plucking it again and sliding to "8", but it doesn't sound right. Is that the way I'm supposed to be doing it?