Ouch. Ok so going by your above post you are planning a burst, so any repair will be covered which is good. Personally I would fill it with CA (superglue) first, then take up any other indent with filler.

There are a number of ways to do a burst, some people get quite good results staining a the lighter colour and then blending in the darker colour from the edge. Otherwise an airbrush is a good idea. If you are handy with rattle cans' you could probably get a reasonable result as well. They do take a bit of practice to get right so I would have a go on some scrap wood or cheap pine to see what's going to work best for you.