I have no idea if gluten is something you can buy???
Anyway, I've made bread, buns, etc. What you use is harina preparada.
Harina preparada is basically flour with a rising agent (baking powder). To make bread you usually use harina preparada plus levadura (yeast).
Bear in mind, if you need really fine flour, go to Wong and buy the Italian Farina 00, that is a flour that is used for pizza dough (the packet has a picture of a slice of pizza), it is very fine.
Oh, and yes, it is very simple. In Peru you only have harina preparada (used for food that does not rise, such as crepes, crusts, etc.) and harina preparada for everything else (cakes, breads, buns, pancakes, etc.).
I hope this helps, email me if anything else comes to mind!