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I agree with Ross. A basic of astrophotography is shorter focal length is easier to image than longer focal length. That is because all the tracking errors also get magnified as you go longer focal length. Adding a barlow increases focal length.
So longer focal length imaging requires a more expensive and precise mount to get good results. Anything less will be frustrating.
The best place to start is to mount your camera with a lens on a mount and do some Milky Way widefield shots 30 -45 second exposures at ISO1600 and the lowest F ratio your lens will give you. You'll get some nice shots that way and be encouraged to continue.
Greg.
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