Get metal silverware, not plastic with metal. 

Go work for a brokerage with a broker who sits in the office and help two friends with transactions before you do surgery on yourself.Get a VA preapproval from an actual Underwriter and stick to under that sales priceCommon Mistakes that come to mind based on what you said:choosing a property that doesn't meet VA standards and losing your EMDfilling out the contracts wrong and getting suednot understanding inspection or appraisal notes and not cancelling the deal before the contingency date, lose the EMD and maybe get suedappraisal comes in low and not knowing how to arbitrate and negotiate, not having compssigning something without understanding the future resultsstating something false in writingsaying something that crosses Fair Housing lawsgetting the numbers wrong, not being able to get insurance in CA, offering on higher price than you qualify for...being busy at day job and not opening emails in time

Hospitals make their real money on elective surgeries.

In any of those cases put plastic over the floor & doors and tape them down around the edges and you can work with the windows slightly open for air flow.

Only thing I can think of was that we left some empty  plastic water bottles (not a place with drinkable tap water) on the counter because the trash cans were full. 

It isn't brain surgery.

They don't make plastic screws/nails yet! 

I had to water proof a couple of places in Seattle where it can occasionally rain (for weeks at a time ;-) One place was located near a stream.We dug about 3 feet deep around the foundation, we used concrete sealer on the concrete inside and out, placed a thick layer of plastic against the concrete & back filled to about within a foot of the surface and installed a "french drain".

Is there is a way i can put some cheap roof(asbestos or plastic shed etc. https://www.google.com/search?

I had renters like that once, and along with being dirty, they got gum stuck in the dryer, nail polish in the carpet, damaged window treatments, burned plastic on the stove, etc.