credit card for business expenses only.

@Ronald StarusnakUsing my dads line of credit

This might be me overthinking and not knowing but I do not have a mentor just the books I read and the information on the internet.

Other things you need to factor in: utilities like satellite TV/internet (which, since the house probably doesn't have access to cable, internet can be An Issue), and will the HOAs allow short-term rentals?  

Without established credit, you will need a co-signer.

They have bad credit, but the husband has now worked an ok job for a solid amount of time.

Landlords who do not follow the law can be hit with fines and/or jail time.As always, don't trust the internet, seek professional advice.

And also what’s the minimum credit score you would need to qualify for the fha loan ?

Yes they transfer to the new owner as either a credit on the closing documents or a separate check.

Look for infrastructure and transportation investments, arts/culture and internet access