Shnitzy: NO!
I wrote a whole long post about this, which apparently did not make it through, but Discworld is not a traditional series, as in it does not go in a continuous stream from the first book to the last. There are a bunch of individual streams within the greater series, and I recommend, as above, that you start with the Watch arc, with Men at Arms, as the first couple books (like Colour) can seem kind of slow to first-timers.