Debit card, checking and saving accounts: Capital One 360—sign up with that link because you'll be able to earn $50 and me $20 (see details on the sign-up web page). Schwab is also a great option.
CapitalOne Spark Business Credit Card: the annual fee option ($59) comes with 2% cash back on ALL purchases. So once you spend $2,950, the card starts making you money—less in year 1 if you consider the signup cash bonus.
Caveat: I am NOT an investment or financial advisor, and no advice here should be taken without speaking to a qualified professional first. Also, investing in securities involves risks, and there is the possibility of losing money. Past performance is no guarantee of future results.