Most importantly, stay out of debt.
Have yet to meet anyone training for commercial ratings who is not in debt in one way or another, it comes with the territory. If one does not have the bottle to take on huge debt then one does not really want it bad enough and is best off out of it.
RAF would be my advice if money is an issue but looking at it logically the chances of meeting RAF pilot standards are rather low but someone has to slip through now and again I suppose! However, it's amazing how easily you can borrow cash for this sort of thing nowdays. You shall need security so if you have parents or relatives who don't mind whacking their mortgage down then you're onto a winner. Ask them - what ya got to lose..... apart from a roof over your heads but hey, let's not get pedantic now.
Best of luck. You need dedication by the bucketload to do succeed so keep the dream alive at all times by reminding yourself why you took on all the hassle!
VFE.