Take a mechanic with your and following items when you go to pick up your car.
Look for rust. Rust cleaner.
The battery would be dead by now. 45 ampere fully charged battery. (Usually new batteries are not fully charged.)
Engine oil. The engine oil must be replaced before starting as it's been years and the existing oil is useless now.
Engine oil filter.
Air filter.
Engine flush liquid.
Gear oil.
3-4 litres of coolant.
Fuel system cleaner to be poured in fuel tank.
20-25 litres of petrol.
Carbeurator cleaner.
WD-40 rust cleaner for loosening any stiff bolts etc
Degreaser spray for degreasing any sludge from outside of engine, engine bay and mechanical parts.
Don't start until you get the engine flushed, engine oil, gear oil, air filter, coolant replaced. Pour in petrol along with fuel injector cleaner.
The mechanic should have all necessary tools.
It will take 45 minutes to get all these tasks done given that the mechanic is efficient and you have all the required items.
Good luck!