@talentryto- You should contact the landlord to see if he is willing to accept Section 8 vouchers, or if his rental does not meet the qualifications. There is a big difference, because one that doesn't meet certain standards will not be approved by the state agency that issues Section 8 in your area.
On the other hand, perhaps the landlord has never been approached by a family that was eligible for Section 8 assistance, but he would be willing to accept it. If this is the case, he would need to contact the housing agency in your area to have his rental evaluated. If it is approved, the family that you are trying to help could apply for the rental in question.