Skating?
I don`t find it that important to learn, I mean, unless you make videos; then you can make them for show, but if you just randomly want to make then, no thanks.
I`d first try and make it to the end of the stair skateboard mod, no tricks, ect.
Then as you move along, try watching tuts on youtube, and mixing things up.
That`s how I learned at least. :s
Good luck with learning!
:3