Puerto Vallarta, with all the amenities of a big city and the charm and warmth of a pueblo, is a perfect place to try your transition abroad. I'm sure you'll like it. First, you must not expect things to be as they are at home.
Nothing here moves with the same efficiency or speed.
Immigration laws and regulations are constantly changing, so check with your nearest Mexican consulate for the current regulations. In a tourist town such as Puerto Vallarta it is not absolutely necessary to speak Spanish, as most of the natives speak some English. But if you want to experience the full flavor and joy of your transition, you can enroll in one of the many Spanish classes the city offers. You may enroll for two or four hours a day in courses lasting as few or as many weeks as you want. Other schools and tutors who will come to your hotel or home for private lessons.