Reply to Complete n00b - any help would b gr8

So, I have been interested in DJ'ing for awhile and after using my friends S2, decided that I needed to get my own gear.

I bought a used VCI100 off ebay. Seller said it has V1.3 firmware. How to check?

Custom BLANK overlay

I have traktor pro 2.0.3

Here are my questions...
Is there any internal difference between the vci100 and the 100SE?
I am ordering an overlay for the the new firmware, until then, is there a map to tell me which buttons do what?

Any other resources, tips, etc. would be great.