I wasn't unprepared—I had a clear idea of my MAO,  ARV, and estimated repair costs.

@Pandu Chimata You may need to start getting estimates if you're planning to add infrastructure to the vacant land.

Could anyone provide advice on the most cost-effective way to construct this and tips on estimating the total cost?

I want to ensure that I follow any sort of regulations and safety standards but I don't know where to even start or know how to estimate rough costs.

A buyers agent, even if compensated by Broker for Seller, will represent the interests of the buyer.Under : "Sellers Estimated Costs" she's got me paying $1,925 in fees. ($675 preparation of deed) ($650 transfer tax) ($300 settlement fee) ($300 notary fee)Also in "Sellers Estimated Costs"  "brokers fee" is listed as "$4,000"   rather than 6% or $4,000 as if the 4k is just a flat rate.I feel this gives her no incentive to sell my property at the highest bidder.

Does Anyone have any recommendations (and/or referral for an estimate)  on a rehab needed for a 5 BR brick townhouse that needs a bit of everything for a flip. 

I do not have much knowledge on real estate but I am the hitting  books: BRRRR by David Greene, Estimating Rehab cost by J.Scott, Investing real estate with no/low money down by Brandon Turner and finally, Rental property investing by Brandon Turner.Outside of real estate, I enjoy swimming, bike riding, watching anime, playing video games and interests in the stock/house market.Excited to learn and connect with you all!

Cosmetic renovations are easier to estimate rehab cost and are still considered "turn-key" to sellers.Happy to connect about any renovation or construction needs.

Can anyone give me a estimate of how well mediums do on average? 

Sometimes fixers need more work than you estimate.