2003 Disco II been sitting for years.

I have a 2003 LR Disco II with about 180k miles which has sat for maybe 4-5 years due to an overheating problem that occurred after several minutes of driving that I believe was due to me not understanding that the system required vacuum bleeding of the coolant system (correct me if I'm wrong). At the very least, what I would like to do is get the engine running again and the vehicle able to drive for <1mi. What should I do to prepare the vehicle for this? Mainly concerned about fluids (engine/transmission oil). Does anyone have any recommendations for the full process? I don't want to destroy the vehicle.