CAPM and PMP all have an element of experience as part of the qualifications, so without experience, you will not be able to take the exam. The initial levels of PRINCE2 require only training, so it will be easier to obtain, but tell employers less about your qualifications. CAPM requires less experience than PMP and only tests for knowledge of definitiions. PMP adds to that a test of your ability to apply what you know to practical circumstances.
But my best advice to you is to seek that work which you enjoy, not which pays the most. I had close to 20 years of successful experience as a PM before taking the PMP, and not quite as many after. But I'm doing what I'm doing because it is meaningful work that I enjoy. Its what makes me want to get up every morning to work.