In the world of GF baking, you've got to start somewhere, and a tried and true quick bread recipe with
Cup 4 Cup substituted for all-purpose flour seems like a good place to start. It is designed with that use in mind and the xanthan gum is already there with nothing else to buy.
Go at it with fairly low expectations and you might be surprised when it turns out OK.
C 4 C is even available at some Wegmans stores. Not mine, but maybe yours.