@Sasha Fukuda - section 8 in most areas has a long waiting list of people who want to get the vouchers, so that’s not an instant solution for most people who have lost their jobs.

Renometer and BP insights are great tools but if your looking for something quick and dirty, and free, I Ike to use the HUD Fair market rent numbers.This is published data by HUD to help section 8 and other voucher programs determine the maximum allowable rent for given markets across the country by bedroom count (1-4 beds).

I am on the fence if I should try to get the properties approved to accept section 8 housing vouchers. 

A landlord who owns 5 or fewer single family rental homes, and no more than 5 total rental units including any single family rental homes, is not required to accept federal housing choice vouchers for the single family homes.A landlord is not prohibited from checking the credit of prospective tenant.

How much is her section 8 voucher for?

As far as new tenants, all you have to do is place someone with a voucher, then they will inspect and tell you of any needed repairs, same thought process, you will have time to complete the repairs and then you are all set.

In most cases, the tenant has had a Section 8 voucher to cover most of the rent.

I'm getting some interest from Section 8 applicants, and after doing some research I'm getting conflicting information on if a tenant can cover the difference between market rent and their voucher amount.

The numbers you see on the HUD website are household budget per voucher size, not rent allowance.  

Need an apt or room with the voucher