Hi,
If you have a job that pays ok, I assume you do as fly as a hobby right now, don't quit to do a full course. Enjoy the flying, building hours. Enroll onto a distance learning ATPL course, bristol is excellent which is where I did it. Spend your time flying when you can, studying a bit and most importantly working in you current field. Oh before all of this go do the initial 1st class medical.
If you continue to love flying and keep making your way through the books in no time at all you will be ready for the exams, part time, hour or so a day maybe a year. Once past that hurdle with a few more hours under your belt take it a bit further with an IR or focus more on the hour building.
You will have to pay for the first 200 hours at least so just take your time and enjoy it. Your in no rush to get into an airline.
My main bit of advice, do NOT quit your job or take out a huge loan to fund this.