Right, what I did in first year was paid my rent (lump sum) out of savings, put about 1/2 my loan into my savings account (with my remaining savings) and left half my loan in my current account. When this was getting low, my bursary usually came in. I would leave that in my current acount, and transfer over money as and when I needed a top up.
The problem with having only a really small amount of money in your current account is you have to keep track of every outgoing- e.g. phone contract, any subscriptions, any additional bills and remember to transfer it over at the exact right time. You can also face problems if you ever pay for anything by cheque. I like to have a minimum of £200 in my current account, unless it's the end of the year and things are really tight. If I ended up with a lot more (say £500, due to wages, bursaries etc) I would transfer some back into my savings account.
I didn't have an overdraft or any credit, but because I'd worked for about 14 months prior to uni (and whilst I was in school on and off) I had healthy savings I could use instead. If I didn't have them, I'd probably keep an overdraft for emergancy back up. I can't remember exactly what my spends were living in halls, but I'll share some of my budget from last year, when I was living out.
What I spent on things last year:
Rent: £225 per month (this is very low, I was sharing a one bed flat with my ex £300-400 is more likely for a room in a shared house).
Electricity:£50
Water: £30
Internet: £22 inc line rental
Food: Very roughly £100 a month, but sharing between 2 people is cheaper.
Entertainment:£40-50
Clothes: up to £60 about every 3 months.
One off costs- stationery, textbooks etc- £300 (this is probably relatively low- textbooks are expensive, and I already owned a printer, laptop etc)