Read, learn and inwardly digest Saucy Jack's advice - some of the clearest I've seen on this site. You have time on your side, so nail that Plan B, it may end up your Plan A!
Don't believe a lot of what's on here. Don't believe that because it's 'all you've ever wanted and it's your heart's desire' it will necessarily come true. Accept that getting a commercial licence will not guarantee a job. Accept that getting that licence will cost you a lot of money.
Good luck if you do go ahead - I think your academic background and skill set are better than fine. Like mad jock I have no idea where this industry is going and how training/recruiting will change over the next few years.