The most simple business credit cards for cash back without spending a lot of money upfront are the Capital One Spark and Spark Select.
The Capital One Spark gives you 2% cash back on all purchases, but there is a $59 annual fee after the first year which isn’t worth it unless you spend a ton of money (I think $11,800 if I calculated right).
The Capital One Spark Select gives you 1.5% cash back on all purchases but does not have an annual fee ever.
There are other cards that have some bonus categories, but these are by far the easiest to understand and use as a business card. They are also widely accepted as they are VISA cards.
There are also cards with sign up bonuses, but they usually require you to spend thousands of dollars in the first few months. If you’re interested, I can look into those for you, too, but it didn’t sound like what you wanted.
If you click through the links above and apply and are approved for one of the cards, I will end up getting a commission for referring you. Thanks in advance if you do 🙂