I wish I had seen this thread a few days ago, Cheryl. I could have given some advice about protecting the plumeria in the ground.
Yes, though I start the process of digging and dormancy in late October to very early November, that's basically what I do. When I bag my plants, there is no soil and no leaves, other than those tiny terminal leaves. You'll always want to make sure the plants/roots are completely dry before bagging. That's about it though. Keep that bag in a warmish place. My bagged plants will get no light and no moisture until I bring those bags out in the spring and pot up the plants.