Physicians Assistant: Requirements to get in the program?

You have to have a Bachelor's degree to get into a PA program (you can major in anything, but most students major in a science). You'll have to check with the specific PA program you're interested in, but the prerequisite courses for most programs are the same as Pre-med courses - it looks like you've taken a few of them. They also require a significant number of clinical experience hours, but in 2 years of work experience, you've definitely got that covered.