Oil trail and lots of smoke from under hood

2004 Honda Pilot was running fine. I was driving about 75mph when I noticed a ton of smoke behind the truck. I pulled over and the smoke was pouring out from under the hood. There was oil all over the engine and a trail of oil behind the truck. I had it towed home and stored for 3 months in my garage while I left the country. I'm going back and need to figure out what the problem is and how to fix it. Any suggestions???