Under any circumstance in which you awake in a strange place with no memory of how you got there, the first thing you should always do is find a tree and punch it until it becomes usable lumber...or you breaks your wrists, which ever comes first.

You all know how to start vanilla minecraft, do that.
Ideally you will spawn near village, which you should immediately and mercilessly loot anything that looks valuable.
In less than ideal conditions, you should seek out a stand of trees, preferably with a lake or river nearby.
Build yourself a basic shelter and make some wood then stone tools.
