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A great start. I wish my initial images were that good.
A Newtonian will need a coma corrector to correct the stars at the edges of the image from being elongated. There are a couple on the market. Televue makes a Paracorr (spelling?).
Also 10 seconds is showing tracking errors which means your mount is not polar aligned. That is a whole procedure in itself and one best learned early on as you will use it over and over - its a basic.
Most mounts even if cheap should be able to achieve 30 - 60 second unguided images with fairly round stars if the polar alignment is good with a DSLR and 8 inch Newt.
M42 burns out the core with any camera no matter how expensive because it is very bright. Usually one takes a series of short exposures like you have and a number of longer ones and puts them together using Photoshop trickery.
Greg.
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