My big question is when quoting a renovation, since I don't have the experience what is the best way to come up with the right ARV so I can make the right offer.

Do you have any prior experience with real estate investing?

I appreciate all the insight and for the most part I do agree with you all on this being the typical experience with STR's.

You can of course do it yourself, but I think hiring expertise who has lots of experience talking to the appraisers, working for other investors, and potentially going in front of the board and potentially arbitrators is probably money well spent.

I would be happy to talk or meet-up to talk about our experience.

I don’t have any experience with investment properties any advise will be highly appreciated Thank you !! 

Does anyone have experience developing residential communities with prefab/modular homes (not mobile homes) or know someone who does?

House hacking will also give you some personal "property management" experience.

We have over 5 years of experience owning and renting long term and recently short term as well.

As Columbia Market Sales Manager, Chris points out below the iterative journey of change we all experience in high school and as a beginning real estate professional persists even at the highest level of high finance and development.