There are lists of commands, but knowing how to dig or how to build something would not be enough to play the game. It is necessary to understand some of the basic game mechanisms to know what you are actually doing and why.
There is the wiki article about the fortress mode:
http://dwarffortresswiki.org/index.php/Dwarf_fortress_modeIt contains lots of useful and needed information to understand the interface and the goals of the game. Also there is the flowchart which gives some hints what to do at all after embarking.
All informations there are quite basic without many spoilers. If you are stuck you will always find a link that leads into the depths of the wiki to more detailed articles.
Even with this guide you know still nothing about embarking and how to do it halfway properly. So you most certainly should have a look at the embark article.
Alternatively you could start with the quickstart guide, which has a more praticle approach to let new players start the game:
http://dwarffortresswiki.org/index.php/DF2012:Quickstart_guideEven if you read all oft that, there is still much to discover in dwarf fortress. The game has such an incredible level of detail that it will take a long time to reach the bottom line. Until then, there will certainly be a new version with new features, Toady is working fast.