Gluten-free and egg-free yeast bread
If you could provide your ingredient list, it would be easier to give suggestions based on your formulation.
If you are making a straight dough gluten free bread, I would recommend temperature 80-100F and humidity 60-80%. The proofing time totally depends on proofing temperature and your formulation (ex. sugar/yeast).
Baking temperature also depends on what type of flour you are using. Starches/flour gel at different temp, so it is hard to say what is the optimum temp as per your recipe. Where you located also matters, if you live in high altitudes place, baking needs slightly higher temperature.
I would suggest you to start with 350F baking, if the bread seems under-baked after an hour, you can increase the temperature sequentially by 25F.
I also agree with Joe, using psyllium husk is much better choice than xanthan for bread recipe.