Going forward the best system is to do regular inspections, quarterly, and when any damage is found immediate have it repaired.

At the time of inspection, no mold was found.

If we put in an offer that is the price we are sticking with unless something huge is discovered in inspection. 

In total the house needs around $30,000 in updates and that price is me doing it myself not hiring out the work which if I did it would be closer to $50k or more but I plan to do it over the next two years when I can and profit as much as I can.

Major fixes from inspection are 1) New roof, 2) New HVAC 3) Repair fireplaces 4) Water Heater.

They will schedule an inspection and if they find what you've said, they will fine/threaten the landlord for you.It sounds like you're taking the high road, which is great - not all tenants do. 

Do I need to have a property inspected by a professional once I get it under contract?

You could always remove the lock if the home is inspected but it usually isn't allowed though. 

I've seen a lot of people get the inspections back and not accepted by a VA loan officer.

The Roofstock inspection, which was admittedly cursory, turned up nothing.