First this system does require one to be both diligent and disciplined. I am not a financial advisor this is just how i use credit to get paid and not the other way around. There are a few things needed in order to get started: income, decent credit, bank account, and little to no debt .
Most no fee credit cards will come with at least a year of no interest. Meaning that if you make the minimum payments you will not get charged interest on any purchases. Though due to a clause in the contract if the card is not paid off by the end of the intro 0% interest period you are expected to pay all the interest that would have accrued. Keeping your balance manageable is a must.
This strategy involves basically living off your credit cards and just using your account to pay the credit cards. I personally only use my debit card to get cash. This is one way banks will pay you with all the rewards, generally a percentage of each purchase. One can also meet the introductory reward spending, which entails meeting a certain amount of spending in the first three months. If you are putting all your purchases on the card this should not be an issue.
I would recommend making payments each time you get paid. This will help you keep your balance manageable and make sure that you pay the minimum balance. I would also suggest automating some funds to be transferred into a savings account. these funds can be switched back for a few months if you need to make extra payments to pay off the card before the introductory no interest ends.Once you have a few months left on the 0% interest card, apply for a new one and reset the cycle. You will then need to switch most of the spending to that card to meet the intro bonus and make larger payments on the old card.
There you have it. I have done this with 8 cards and have not paid one cent of interest.
A few cards that will get you started