How can you get your car started if it hasn't been started for 5 months?

First, I would check the oil and coolant to make sure neither one is outdated. Look for water in your oil and check to see how black and gritty it is. Then, probably just hook jumper cables up to it (if it doesn't start by itself) and it should start. I would let it run for several minutes to let the engine relubricate itself.