Before choosing a program, you first want to think a bit about yourself and your interests. It might be helpful to think about what you would like to work with or what you would like to do for a living.
Start with your interests, skills, goals and career aspirations to find a suitable program. In order to keep track of the wide range of options, think about your general interests and the type of program you might be interested in.
Surely, you have found some programs you are interested in. In order to decide which programs you want to apply for, it might be useful to prioritize your decision factors, single out your favorites and explore them. On the ground, if you need to.
After having taken a closer look at your favored programs, make a ranking list of the programs you are interested in and decide which ones you want to apply for. Apply for a few back-ups in order to actually receive a study place.