For the bevel script, you probably want to have the value on the slider bar very low--I often use .01 or so.  The numbers on the left and right of the slider just are the end points of the slider, you can change those to make it more usefull at larger or smaller values.  The recursive value is how many times you want it to be beveled, so one just bevels the original edge, 2 bevels those new edges to get 4 edges, 3 bevels those 4, etc.  This number isn't applied until you push the "recursive" button, which you should do after hitting the bevel button.