I’ve spent the last five years perfecting different GF baked goods, breads, desserts and treats and highly recommend the book Gluten Free French Desserts & Baked Goods when you are ready to do more of your own baking.
For basic bread options you may want to consider:
UDI’s has a storebought GF bread in a few types (white/multigrain) that works well for french toast and sandwiches udisglutenfree.com/products
Sensitive Baker/GFmeals.com offers a tremendously good foccacia that works well as a base for many dishes – their crusty french rolls are ok but may be able to do better inhouse.
For other sandwich rolls & pizza crust options our other favorite is Sami’s Bakery: www.samisbakery.com/products/breads/
The one tip I’ve learned from years of baking GF is that the breads that use tapioca & potato tend to be more soft and bread-like than the rice-based loaves, which tend to be too dense and mealy for anything but hard toast.
Enjoy & stay healthy!