Hey Carl!
Good Luck with the new game, I hope you find a group soon. BWG is such a great game, Im sure you’ll love it.
As for your questions, I would just say more of what Valannor and Dionysus said.
Start with the first 76 pages or so, the “Hub and the Spokes”. Really are the rules you need to play a campaign are there. Especially with a new group dont feel forced to add in any of the auxiliary rules like, Fight!, or Range and Cover, etc. You can get to those when you’re ready. The Hub and Spokes has everything you need to create dramatic, tense, super charged games that will stay with you forever. I’d say play your first 4 or 5 sessions with just those rules until you feel comfortable with Task and Intent, Helping, FoRKs, and Advancement. Then one session sneak in one of the other systems, Fight! or Duel of Wits!
Also, when you do get ready to incorporate Fight! or Duel of Wits, dont be afraid to do it slowly. Dont be afraid to have your book beside you and as the players reveal their script, look it up in the book, read it to the group. This way everyone learns and it helps to keep the group invested in the Fight! - well, it did for my group anyway.
As said above as well Shaun Hayworth has plenty of good actual play videos on youtube, and I’ve spend many an hour, and they’ve helped me.
But just take it slow and remember above all to focus on BITs. The character’s Beliefs, Instincts, and Traits. Find ways to challenge the player’s BITs, to make them struggle with them, and by just using the Hub and Spokes, you’ll have a great game.
Let us know if you need any more help.