going to buy arduino for the first time need help

I am going to buy an arduino board for the first time and was wondering how i learn how to program a LED matrix. any links to sites or instructional videos would be appreciated :)

Start here… (buying)

http://www.arunet.co.uk/tkboyd/ele1psa.htm

… in particular, look at the subordinate page…

http://www.arunet.co.uk/tkboyd/ele1psac.htm

… which talks about your options regarding where you’ll have your USB circuitry.

=====================
Go here for “how to program”…

http://sheepdogguides.com/arduino/FA1main.htm