Finance options to purchase Duplex & construction afterwards

[Adriana Rozo]

So I was planning to get this duplex close to the beach in Palm Beach County, FL , to do simple rehab then rent it as a vacation rental.  However I was only to able to see it after I sent an offer.  

The house is from 1930, wooden ,  rooms are so small and structure doesn't look good to me.  I don't know much about construction, but I think is just not worth it to rehab it.  

How can I get finance, not only to buy the duplex, but to demolish the front building and make a new one?  Maybe adding one bathroom and adding building space.   Can I get a fix and flip hard money loan with options to start paying interest only after several months?  Or am I dreaming?

Do you guys think this maybe a too big of a project for a newbie investor?  (I thought I was an investor back in  the crashdown of 2008,  lol ) So I am basically starting again, 12 years later...

This duplex has a prime location I don't want to let go, but I am afraid this maybe too much of a headache and a big jump to start.

Any thoughts, ideas, suggestions.. Anyone willing to give me private advice is most welcome.