Engine problems

Just bought the car in fall of last year. Twin turbo model. When started up the car blows smoke out the tail pipes for a little while and eventually stops. White smoke I think. Unfortunately I let the car sit for a few months during winter without starting it. Now when I start it I get A LOT of smoke out the tail pipes. The oil pressure gauge reads zero even though it has oil. And there is a loud ticking sound coming from the top of the motor. I'm afraid to run it long in fear of damaging something but the smoking now doesn't seem like it's going to end. It's thick and smells like something burning. Temperature gauge is where it's suppose to be. Also, don't know if it's related, but the speedometer stopped working before I let it sit. Don't see any blown fuses.