Spanish is one of the few languages where the phonetic pronounciation is so regular and simple, that once you know how to read each letter separately, you can read all words. Someone used to learning foreign languages shouldn't need more than an hour to read effortlessly. A page like Wikipedia should be able to tell you how to read each letter, but if you are still not sure, I can give you as many details as you need.
For example, the vowels are read like this:
In diphthongs, the i becomes /j/ if it is followed by another vowel, like "ia" or "io.", and the "u" becomes /w/ before any other vowel, like in "ue".