I have a Black and Decker but it's at least 8 years old now so I couldn't recommend a particular model. Unless they've changed a lot - and I don't think they have - most (if not all) bread machines just need the ingredients put in (yeast goes on top), push a few buttons, and the rest is automatic. Some recipes do require ingredients to be added part way through the cycle (raisins are added part way through if you're making raisin bread, etc.).
The main recommendation I can make is if you're only making bread for yourself, a smaller machine is o.k. Otherwise, get a machine with a 2-lb. loaf capacity. Take a look at the loaf pan and keep in mind the bread won't rise out of the pan.
I used to use my bread machine a lot (a few times a month), but now I only use it a few times a year at most. It's very easy to use, and nothing beats the taste (and smell!) of homebaked bread. The only complaint in my house was that the crust was tough - it is a little hard to cut, but a bread knife does the trick.
As far as gluten-free - Bread machines specify using bread flour - ? If you haven't checked already, make sure that gluten-free will work in a bread machine.
Deb