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I remember my first deep sky object was M1 the crab nebula, it was at a dark site in a 4" dob! I don't recommend this object visually BTW as it is stupidly faint. I thought man that's amazing, but I hope not everything is as hard to find and faint as this one!
Centaurus A is a nice galaxy. It's fairly large so perhaps the 15 and a barlow is a bit much. You should be able to see it as a fuzzy ball shape with a distinct dark lane in the middle. Of course how clear this lane is depends on your observing site as just a bit of light pollution or a streetlamp that you can see is enough to take the contrast right away.
The Sombraro again is a fantastic galaxy. You will be able to make out that it has a brighter core, it is long and thin and you may well be able to see the faint line seperating the top and bottom halves.
Don't forget to try using averted vision as this will make it look much brighter. Just look off to the side and a bit above it should appear much brighter when you get it right, look directly at it and it will dim again.
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