The Unknown,
All correct apart from once you've done IR, MCC you should go direct to the airline.
Multi rating takes 1 month max, IR/MCC = 2 months.
AFIC is aeroplane flying instructor course.
50 to 180 hrs...get a night rating and IMC ASAP as very useful anyway, plus will teach you a lot about your own ability (instrument procedures etc) to be an airline pilot.
Your cheapest option is to go to Cabairs Florida PPL school (you could go anywhere in the US, but Cabair love it if you do your training with them, and cost is about the same anyway) - you will save approx 50% in money and 75% in time to get the ratings and hours, plus get a nice holiday. If money is not a problem, it is always useful to do some hours in old Blighty as airspace, RT, procedures, weather etc are very different to US.
I didn't go to the US, so you should probably find someone who has to find out what it is like, how long you need etc.
Good luck, and remember there are lots of sponsorships out there, so apply for them all! Nothing ventured...