You should be able to pick up another router bit from your local hardware store.
A standard 2 flute spiral bit should work
It may be a problem getting a 1/4" (6.35mm) locally. If all you can find is 6mm router bits one solution is to order up a 6mm collet for your router.
Here is one source for them: Elaire Corp
The other option, of course is to order your router bits on-line.
It is a good idea to double check that you have the correct sized bit in the correct collet and have the correct bit size entered into easel.
I recommend getting a cheep digital caliper to measure things. I use mine to check the thickness of wood as well.
I have a feeling your spindle is not perpendicular to the x-y axis also… those ridges seems to point to that unless it was intentional. But yeah burning because your spindle speed and feed rates are off.