If you haven't storyboarded before, just draw or print out a blank storyboard page, photocopy it and draw away. The one limitation to doing it this way is that it's not ideal for editing panel order and inserting panels.
The way I used to do it was to draw the panels on index cards, scan them in, and then lay them out in Illustrator so I could edit and insert panels as I developed the board. (If I still took this approach today, I'd probably use a page layout program like InDesign instead of Illustrator, but really any drawing or painting program will do.)
Or you can go 'old school' and pin the index cards to a cork board. (I've done it this way too, both for personal projects and work.) This analog approach is more interactive and well suited for team discussions. Of course these days, it's all gotta go into the computer eventually.
In recent years, I've been using TB Storyboard Pro, which is good if you also want to render out an animatic directly from the storyboard file. The Pro version is a bit expensive though so you might consider Storyboard Standard instead. It is much cheaper and, while it can't output an animatic, it can output your panels as images. Once you have your storyboard panels, just place them on a timeline in an editorial program like Vegas or Premiere. This way you also have better animation and audio capabilities. There are other nice features in Pro besides animatic output but, IMO, the standard version should be more than adequate for most indie artists.
So what's the big deal with Storyboard? The drawing tools are sufficient but the real reason to use it is for the excellent planning, editing and sorting, the various industry standard layouts to choose from, and other time-saving organization tools. Basically, it eliminates a lot of the 'boring' work that can go into creating storyboards so you can focus on the fun parts.
As for creating a storyboard directly in ASP, I guess you could do that but I don't think there much benefit to it. ASP is not the most efficient way to draw quickly, and the key to storyboarding is to do it very quickly--get all the pictures out of your head and sort them out when you're done. Don't fuss over the drawings because all you really need are thumbnails to tell the story--save the 'pretty stuff' for the actual animation.
FYI, I did a short article about storyboarding one of our shorts here:
Storyboarding 'Happy Box'
And then there's this, which isn't very instructional, but it does show that the boards can be pretty crude and still be an accurate 'blue print' for the production.
Making 'Hello Frankenstein'
BTW, this storyboard was just drawn very quickly on typing paper. (Geez! I just realized the cats are 10 years old now.)
When you really get down to it, pencil and paper is all you really need if you want to get started right away.
Hope this helps. Good luck!
G.
P.S., I've also used a few storyboard programs for iPad and Android. Will post info about them later.