Apprenticeships - HELP

Basically, long story short, I was 'kicked' out of my house at in October 2014- I am 17 and currently living with what we will call 'ex-family friends'. I'm looking to start an apprenticeship after I finish my A2 exams - and I'm wondering is it possible to even live off £105 a week? Would I be entitled to some sort of benefits? The people I am staying with currently have no relation to me- and are letting me stay in a spare part of the house with no rent- Yes, I know I am lucky- but I am just wondering whether it is possible to get a place of my own, because although it is great being here, I feel more of a burden everyday- which is why I am keen to be able to set up somewhere of my own and be able to pay for it through my wages or benefits or whatever! - so is it possible to survive on the wage and if not am I entitled to help? :s-smilie: