Well, as most of people here I am interested in switching to the Post-Study Visa after I finish my studies. And like most of them I've read all the policy guidance, appendixes, immigration rules - you name it. But like most of them, even after reading all that materials I still have some fears and doubts, that is why I just want to ask a few questions, just to be sure that I am on the right way

1) It is time for me to put my money into my account. For that reason I want to open a new account to put required money into. My current one from my current bank is kinda "dodgy", as I receive salaries from two places, so I don't want HO to know about that. I want to open a new account in a different bank and I've chosen to open it in Barclays. So my question is: will the Barclays Bank Account be ok to put money into? Anybody tried that one? Is it fine to maintain funds for visa extension in that type of account? Is it recognized (not Barclays Bank itself, but Barclays Bank Account) from HO as a current account?
2) Do I need to do any transactions from that account (e.g. show some money input-output, direct debits, etc), or I can just simply put money there and forget about it and then go to the bank after 3 months and request a letter along with statement?
3) How's the Barclays in general in giving letters for HO? (I've heard that many people have had problems with Lloyds, as they refused to give or confirm statements)
4) Silly question, but still - does "3 months" in Policy Guidance means "93+ days", e.g. can i show them amount from, for example, September 10 to December 12, or it should be the whole September month + the whole October month + the whole November month?
5) I've read somewhere in Guidance, that I also need to show, along with statements and letters, that the money are still in my account (i.e. if I apply in person and go to HO on 12 July, I also need to have some letter from bank that the money were available to me on 11 July, regardless if I already have a letter with statement covering 3 months, for example from 4 March to 4 July). Is that true? If so, how can I take such a letter from bank in one single day?
6) My wife will apply with me as my dependent. Just want to double check: will it be fine if I will show all the necessary amount for me and her in my account, not in our joint account or separately my account for me and her account for herself?
7) Will it be a problem if, for example, HO will check and find out that I opened account in Barclays just now and putted money immediately on it (e.g. it will be obvious that I opened this account to put required money only)? Do they care when the account was opened?

It's all for now. I will deeply appreciate your help! Hope this questions will also be helpful for the others.
Thx guys in advance!