The following sites have some good information on this subject.
Dude! Self Lender! The company is now called just Self. Download the App pick a plan. I pay $20 a month And they report to all 3 credit bureaus for me. After one month my score raised 32 points! After the second month it’s up 51 points! It’s legit, Self Credit builder app in play store. After that pay a $200 deposit to OpenSky Secured credit card. They accept everybody as long as you pay first. After those two steps you’ll be in the right direction!