Honestly everything they need to know about credit repair can be found in a single article, and it's free:
The Real Estate Professional's Guide to Credit Scoring & ImprovementThat's an industry filled with rotten apples, and basically paid to babysit people to make sure they stay on the financial straight-and-narrow.
Of course, some people need babysitting, or need to pay for something just to feel obligated into following the guidelines. It's like gym memberships: sure, someone could run and exercise on their own, but if they're paying someone else to oversee them, they actually do it.
All right I'll get off the soap box, good luck helping people with their bad credit.
Cheers,
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Brian
Rental Lease