First look up the prerequisite list for your school and a few other schools where you could see yourself applying. These are usually listed on the "Prospective Students" section of pharmacy schools' websites. Keep in mind that some courses must be taken in a certain sequence (think chemistry).
Next look up application deadlines for your potential schools and get some idea of when you should take the PCAT and start the application process. Start working towards that end.
Now add some extracurriculars. Clubs, leadership positions, research. The best is going to be some kind of realistic pharmacy experience. Keep in mind that you probably can't do everything, so pick a few things to really commit to.
Finally, major in whatever you want to major in. As long as you complete the prerequisites, your major matters none. Pick something that you could see yourself doing if you happen to change your mind or don't get into pharmacy school. Keep in mind that many (most?) of the applicants are going to be biology and chemistry majors (myself included), so if you want to look different from the crowd then majoring in something different is one way to do so.
Whether you can get in after 2 years or if a Bachelor's is required varies from school to school. Again, check their website.