What are other jobs that are similar or related to a photographer?

There are many jobs involved in Photography. There is the creative side of capturing imagery (photographer), styling the subject, or using software for image manipulation or there is the managerial/business side which involves studio management, post production management, sales and marketing. The best option for somebody starting out would be to go into a very busy studio and start assisting and show that you want to work and without doubt people will see this and opportunities will arise!