These are described in the actual DSA extension: http://www.opengl.org/registry/specs/EXT/direct_state_access.txt
You can get arguments and their names from that site.
If you are unsure, the usual approach is that whatever you call in a Bind function (BindVertexArray, BindTexture) becomes the first parameters of the DSA call. The other parameters are then the exact same parameters that you would use in a non-DSA function.
Also take a look at this: http://www.g-truc.net/post-0363.html
Keep in mind that when working with vertex array objects, there is one thing you cannot do with DSA and must use the old way: http://stackoverflow.com/questions/3776726/how-to-bind-a-element-buffer-array-to-vertex-array-object-using-direct-state-a