Trevor,
How old are you?
Correct. You don't, at the moment, have the right to live and work in Europe.
No. You don't have the right to live and work in Europe. You are not going to be approved for a work visa
https://www.gov.uk/tier-2-general
to work at Mcdonalds!!
You will be eligible for a work visa if you are qualified to undertake one of the jobs on this list and can persuade a UK company to hire and sponsor you for a visa.
https://www.gov.uk/government/upload...ember_2015.pdf
How are you going to pay for CTC if you get British Citizenship? Do you have the money already? I'm not sure you appreciate the magnitude of what you're trying to get yourself into here.