tip/advice
find out your nearest window cleaning supplies shop and start up traditional you will need a pair of ladders(£150) pointer ladder(70), mop and squeegee(25),pockets(15),microfibre cloths 6no,and cill cloths(50)....so for under £300 you are up and away
I would then see if you can help another w/c to pick up basic technique etc whilst canvassing your own work up good luck on yr journey!!