Would you be open to me asking for advice here and there as I get my footing? 

@Marc Rice     Bingo!

You will most likely incur exploratory costs (money at risk).Maybe get control of the parcel(s) that unlocks it after searching for easements on them and finding none.If you find an easement then Bingo your unlocked.Control might be available via options.Pay attention to this upfront>>>Big parcel like this on the water my first thought in the states would be Phase I enviro. 

So I am trying to put my best foot forward first deal wise. 

Hello Justin Neben, I always started with what the LOT Value is...Then, add on the New Construction Cost to build the 800 sq. foot Duplex.

Use average price per square foot for the area, cost to build new/replacement cost, raw land costs. 4.

The benefit tho, I can now list the property with a dry basment with new footing drains and sealed exterior walls in the event the new owners decide to finish it.

What I think I am looking for is a respectable range on a cost-per-square-foot basis.

What's a good price per square foot to pay a builder in 2022? 

All of the walls of the 600 square foot room were covered, in most places ceiling to floor, with women cut out of hard core porn magazines.