any good reputable companies i can try applying with?

I believe that through section-8 the tenants still have to apply, and as the landlord you can choose to either accept or deny their application.

If you gave her an application you should have asked for everyone living in the apartment etc.Perhaps what you should have done is given BOTH tenants notice of new ownership, advised their leases are expiring 8/31 and in order to possibly renew they would have to complete a new application and meet the new criteria (which you have written down and applied equally to both tenants) THEN advise her she didn't meet the criteria and therefore lease not being renewed.

The tenants will need to indicate my telephone number as the account and their address and the credit union will apply their rent to my account. 

From flips you can move to BRRRRs and apply what you already know from your flipping experience and add the new dimensions of learning the rental and property management side of investing.If you're not handy (no shame in that) or don't have much time on your hands, it may be best to stick to turn-key buy and hold investments in single family, and hiring out property management. 

If they don't know that CAP rate applies to 5 units and up, they are not going to help you going forward and probably don't know what CAP rate really is.You can ask if they know wholesaler or work off-market themselves.

@Lucian Guadagnoli most answers to a question start with "it depends" I can tell you new builds are over $100 a foot (more like $130-150) with out the land (so add the cost of location to that) so that would be the most, then adjust downs from therethe phrase "it depends" applies to location, quality, functionality of the floor plan.

I am fairly new to the MF investing and have a few questions.1) Can a loan be applied under LLC or has to be applied by the partners of the LLC?

The problem is most tenants don’t give a you know what and you need them to apply for assistance which they won’t as they don’t care and get nothing out of it as they are getting their free checks why do they care if landlord gets paid.

Then they apply the cap rate formula I posted above.