I would love to see how to get started .from purchasing the land, permits,  and simple question for a newbe like what's the min acres you need to build...

The Theory is this:(Quoted from VA.org: Those who apply for a VA mortgage with another veteran (a VA “joint loan”) may be permitted extra units for business purposes, which means your multi-unit property could have more than four units.

We've already collected around 20,000 pre-reservations, equating to approximately $30 to $40 million, and have received hundreds of requests to build individual units.We’ve completed the first unit, which has passed the final county inspection under a residential permit, and are actively working on the second phase.

Their city government website has information on short-term rentals and how to register for rental licenses/permits.  

If you're just adding a door, you probably don't need a permit. 

If there's competition for the property, you might need to provide a price first and renegotiate later, especially if you have a contingency for well and septic issues.Step 4: Fixing the SystemsAfter securing the property, we start the permitting process for well and septic repairs immediately.

Additionally, they may only permit you to borrow up to 75% LTV (considering your existing note).

First few months, they blamed the city’s back logs for issuing permits.

You can get all your permits in order before then so you’re ready to go, but you might have to wait a year to start the project depending on when those leases expire.

Some of the stricter regulations you could see include an 8% transient occupancy tax, the owner (you) having to occupy the residence for 180 days per year, reapplying every year for a provisional use permit, limiting number of occupants, and special permit fees ranging up to $500 per permit with a public hearing per permit.