Hi Baz36 and welcome to the forum.
Firstly, can I say you have taken the hardest step - facing up to your debts. I had debts of around £65k and I buried my head in the sand for far too long.
I'm not an expert, I'm only speaking from experience, but I will try to answer your questions from my own experience. Your overdraft will form part of your IVA, therefore you will need to open a basic bank account with a bank who are not one of your creditors. I didn't have an overdraft (I had everything else though!) so I didn't have to open another account, so I don't have any experience on basic bank accounts. However I gather from other posts on the forum that Abbey do a basic bank account and I think you only need a driving licence and utility bill to open one. I think Dominic has one, so I'm sure he will correct me if I'm wrong! Other banks with a basic account are Natwest, Lloyds and Nationwide. Just make sure that the new bank is not one of your creditors, or linked to one of your creditors, eg Lloyds is linked to Black Horse.
Regarding payments due on credit cards, I was advised to stop making payments as soon as the IVA process was started. I understand some IPs might say to make token payments though, so you will need to confirm that. Once you stop making payments, you will get letters and phone calls from your creditors. Forward the letters to your IP, and when you receive phone calls inform them politely but firmly that you are proposing an IVA, and these are your IP's details. Some will be persistant, others will make a note of this and may not contact you again. I didn't hear from Barclays and Egg again once I gave them this information.
The above information also applies to personal loans. I was told to cancel all direct debits for loans and credit cards. DO NOT CANCEL DD'S FOR ESSENTIAL BILLS, EG MORTGAGE, COUNCIL TAX, ELECTRICITY, GAS ETC.
I'm sure once you have spoken to the consultant you will feel a lot better, but I hope the above information helps. The main thing to remember is you are doing the right thing.
Don't worry about moaning - that's what the forum is for! If you have any questions post here, and I'm sure that someone will be able to help you. Also, don't worry about asking your consultant or IP questions - that is what they are making a lot of money for, so make them work for it!!!
Good luck, and keep posting to let us know how you get on.
Three down, fifty seven to go until freedom!