You can create your own by going into Commissioner Mode, and then to the Free Agents page.
From there, there is a "Create Fictional Player" button at the bottom. From the drop-down box, you can click on "Draft Eligible Prospect" and then fill out the rest, including how many players at each position you'd want to create (for fast filling!).
BTW, if you go to your Game Setup/Rules page, how many rounds is the game set up for in the "Create Players For X Rounds" box? It should be somewhere between 31-35 if you have a 30 round draft.