I've got the market for it to some extent and I'm pretty confident I could make some good $ on it, at the very least I wouldn't lose anything based on what I'd have to put in. 

After filling it with my purchased items a couple times it was pretty much a normal rehab.If it's a listing, you could try to find a cleanout company that will agree to be paid out of escrow, or there are lending programs that offer home renovation loans to fix up homes to be sold.Be careful working with wholesalers as an agent.

The area I'm considering seems pretty rural, especially for Baltimore County.

North of I-30 is pretty much fine across the city.  

So because of that im looking to buy my dad's land and build a duplex on it, one of my uncle has been doing this for around 8 years and already has 6 duplexes built, he's getting negative cash flow or break-even if lucky on his units, ive heard cash flow is important when buying rentals units but all he get is pretty much 50k-100k equity when built and mortgage pay down from his tenants and good appreciation, is it worth it for me to build a new duplex if i need to withdraw 100-200$ a month to pay for my negative cash flow each month?

It seems like a pretty solid choice for building wealth.

It's all because the property has to be inspected along the way before each draw is given to the contractor, the contractor has to be vetted by the lender and also be a willing to work with oversight but it's all very doable and they have it down to a pretty good system now.

So i walked in to take a look.Overall its pretty nice most of the interior has been remodeled.

I live pretty close by so it's easy to drive by coming home from work.

That is a pretty big range and not very helpful.