1. Only one bank account (with a debit card) into which everything I make is direct deposited
You have no retirement or other investments? No money market accounts? No savings accounts? Nothing which pays any interest? Why not? Are you married? Do you trust your wife or girlfriend? No kids with bank accounts to keep track of?
Mandating having only one bank account is taking a woefully simplistic approach to finances.
2. No credit cards (they are EVIL)
Credit cards are not evil. Interest rates on credit cards are evil. As long as you pay on time and don't charge more than you can afford (yes, it IS possible to do this while maintaining one or more credit cards in good standing and not paying a dime of interest), you will have no problems.
Last year I charged $5000 worth of home improvment supplies to my credit card in one fell swoop. They gave me 12 months no interest to pay it off. So I took the $5000 I would have spent on paying it off the next month, and stuck it into a 12 month CD (a poor investment, but fairly safe). A couple weeks before I was about to get socked for several hundred dollars in back interest PLUS the balance owed, I cashed in the CD and kept the additional money it had earned, and paid off the card.
No interest paid, and someone ELSE carried the debt for a year while I used the money to sit in an account and earn interest.
Credit cards are not bad. You just need to know how to use them responsibly.
