Lost ! please help !?

I absolutely love Lost but like you and many other fans we have a million+ questions. I think Michael is the man ben has on the boat. I don't know what happened to Walt, I think he may have died. Ben is a mystery, but I think it was him in the coffin at the funeral Jack was at in season 3 finale. Noone knows what the black smoke is yet. And the guy in the hut in the chair was Jacks dad.