AP515 has good advice! You don't need to raise the action by much. As your touch improves, you'll be able to fret notes behind the slide. If your action is too high, those fretted notes will be sharp. If you are dedicating a guitar to slide, and have uindividual, height adjustable saddles, you can flatten out the radius (I don't worry about too much). I like being able to fret and not worry about the intonation on the fretted notes.
Raising the nut effectively removes the ability to fret in-tune notes behind the slide. It might not seem important as you get started, but it's a who,e different world if you stick with it.
I also prefer 11s or 12s for a dedicated slide guitar, but am fine with 10s. I just have to pay a little more attention. The heavier strings support the slide more.
Shameless, unpaid plug: check out Rock Slide, if you are interested in glass or brass. They are my favorites, and make those fretting notes easier, too.