Highly suggest getting your FIRST class medical before you start to make sure you are even eligible for the airlines.
Online doesn't matter. Most do online and it works very well.
My route was go to ATP, get my ratings ASAP, build my hours, and then get my online degree while building hours since you don't need one until you get to the majors.
Also, you can use your FAA licenses (commercial, single, multi, instrument, ATP) towards Aviation degrees at verious colleges such as UVU, ERAU, ASU, etc etc which sort of saves a little bit of money and time.
just my thoughts.