I hope you consider going to university and completing a degree outside of aviation with good scope of employment.
I wish I had done the same but I followed my heart and not my brain.
If you've decided that you will be going down the modular training route, then you must have a full time job enough to cover all your expenses at a minimum. Getting a job after modular training is very very difficult. There are thousands in the UK qualified down the modular route without jobs and any prospect.
Go to uni, study hard and enjoy the uni life.