If you are new to Minecraft, then this walkthrough will familiarize you with the basics of the game and help you get started. It describes how to survive the first night of Minecraft's Survival mode, with the default control scheme in single player mode. Keep in mind that since Minecraft is a sandbox game, there is no one way to approach the game.
However, in Survival mode all players need to find ways to defend and fend off hostiles, that can be found either in dark places (e.g. caves) or when night falls. For this reason, it may be wise to familiarize yourself with the contents of this walkthrough before embarking on Survival Mode.