Where should I start? It hasn't been started in 30 years I'm assuming. Pour some oil down in the cylinders? Try cranking it over?

I fell in love. What the hell is this? It was listed as a "1970 susuki van" on craigslist. It took a tractor to load it up the ramp of a 5x9' uhaul. Have not tried starting it yet. I spent 500 on the van and 100 on gas and trailer. I know it was last registered in 1980. probably hasn't bee...