To apply for a product manager post, you will need a basic qualification of a business related course. To get a specialization you can also go for management course. Some of the skills required are to secure the sale of goods and services, estimate demand, and develop strategies. Your communication skills should be sharp and you should be able to talk to multiple people and departments. Hence it is related to Business, users and technology.

So once you have completed the basic qualification you can start with internship or full time job as a fresher with the companies you are interested in. Product interest depends as it can be education products, fashion products, etc.

Good Luck!!