I will have a number of banks that I will need to deal with. Each bank account will have a purpose, and while some of them will be temporary, a few will be permanent. I would obviously keep my checking account which I currently have, and will consider a savings account to function as an emergency fund. Considering that I will be making a lot of money from the realty investment, I should be fine, and not have to worry about an emergency fund.
I will still continue to using my credit card for every day purchases, and bills. I will also pay off the cards in full to avoid paying interest charges. The only difference is I will be paying off the card every 2 weeks rather than monthly. This will again assure that I will always have my cards with a lower usage utilization.