I would start out by finding out what kind of food is available locally to you.
Feed Mills are a good place to start as they usually have a good selection. Petco sells Solid Gold Products which are good.
Go around to the different stores and see what your options are. Write the brands down and then go to
Dog Food Analysis - Reviews of kibble and read the ratings for the brands and pick the highest quality food you can afford.
Don't be shocked by the sticker prices either. High quality dog food is expensive per bag but a bag lasts longer as you feed less. There is less poop and a healthier dog.
Some brands to get your started: Canidae, Taste of the Wild, Solid Gold, Nutro Ultra, California Natural, Innova, Orijen, Timberwolf Organics.