There are not issues with giving funds, but you have to define how they are given - are they a gift, a loan etc...

I would also recommend doing your due diligence on the new lender, and make sure they are not just a salesy loan officer trying to win you over with term sheets that don't exist... 

20 to 25 year amortization is pretty standard for commercial loans, in my area at least.

I agree with everything @Michael Baum said.Many people, including myself, have used a 10% down second home loan to buy a property used for a STR.

I’ve actually had a number of people exercise their option and get a loan and buy the house.

They can be sold to owner occupants that get a conventional, fha or Va loan.

Consider FHA loans for lower down payments and reserve for repairs or upgrades.

HELOANThis takes second position and is a closed end loan, meaning it's given as a lump sum similarly to a "regular" mortgage.

Pretty much my first step should be work as a loan officer and then the rest will come to me?

Great tools that get updated regularly.I am on the lending side of things and would be happy to hop on a call with you anytime to discuss financial strategies and help answer any questions you may have about nearly any loan product available to help you on your journey, even if they are not products my capital partners offer.We are all here to help you learn and grow.