If you are new to collecting prints you could start by looking at prints in galleries, museums, print workshops, and art fairs (see list below).
Most museum print collections have a print study room where you can arrange viewings (for individuals or groups) of a wide range of prints of your choice by booking an appointment in advance. This is a great experience, well worth doing. You can ask to see a general selection representative of the collection you are visiting, or more specific prints by particular artists. The Ashmolean’s print room does not require advance booking.