Remember, it's the first time.
One, read PB 101 in the Open forum (near the top of the page)
Two, season it, put it in, plan on 2 hours per pound. Have a good temp probe to test the temp
Three, take it out at 195 (your first time) and eat away.
Just put 2 chunks of wood (it's your first) so you don't want to oversmoke. Start with that and adjust up or down from there.
Read through the Open Forum there are a lot of posts about PB and there is also the Pork Archives. More tips and info there than you can ever read; current archive has over 500 topics and 3500+ posts