Congrats on the funding! I was also awarded mine without being totally sure what it meant so I understand what you mean: the ESRC aren't that helpful in telling you! Basically you get a wage, I get mine monthly through my uni, into my bank account. I can spend this as I wish. Unis have different methods, so yours may be quarterly... You probably also get a yearly research training grant of around £750 which you can use to reimburse money you spend on things directly for your research: books, photocopying, travel and accomodation to conferences etc. You can also get a stipend for you fieldwork. Being funded is an amazing priviledge and means you can concentrate on your research more than most people who need to earn at the same time. Have you looked at the funding guide? There is an ESRC studentship funding guide online which tells you what you are entitled to.