As with the rest of Spain, breakfast is usually light, usually some sort of bread e.g. toast or churros. Traditionally, a hearty meal in the early afternoon is followed by a siesta as the heat builds, then a light meal is taken once the sun goes down, so bear this in mind when picking dining times. As elsewhere in the region, seafood and rice dominates, with paella in the frontline.
In tourist-friendly areas, you will easily find restaurants with a "menu of the day" or a similar special for €10, a three- or four-course meal with or without a drink. This is an excellent way to economise if you want to splash out later.
In tourist areas, you'll have no problem finding UK fare served at UK-standard times, if you find yourself intimidated by the local cuisine.