After all, if you knew all the information already, you would not be taking the lessons. You should be ready to start from the beginning without being offended because only then can the instructor know exactly where you are and what your individual strengths and weaknesses are. Experience with horses does not necessarily mean you have mastered all the skills that your chosen instructor deems necessary. While you need to be alert and prepared to learn you should still be relaxed. You are doing this because you enjoy it and have made the decision to learn more and improve your skills.
Most students take lessons once a week.
However, more lessons per week are more expensive. A once a week schedule requires that you only miss your lesson when absolutely necessary. Missing lessons is a principal cause of problems for many adult riders. Everyone is busy and there are many demands on time what with work and parenting responsibilities. Be sure to schedule your lessons at your most convenient time and if you foresee problems check on the instructor's make-up policy.