1 - you have to get a 4 year degree if your ever going to get to the majors or the nationals for the matter. So go get one regardless. To become a regional pilot it is just having the minimum hours, doable without the degree.
2 - Get a degree outside of aviation, a Pro Pilot degree is only good for making a paper hat out of if you loose your ability to be a commercial pilot. Don't do it, get a degree outside the aviation industry if possible. Business admin would be good if you want own a business.
3 - Start flying, you'll need 180 hrs min. for a 141 program. And arrive at an answer to question early on "Is this what I want to do?"
Best of luck
-fly