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Do you have a good star chart? If so star hop with your low power eyepiece until you get to the area where it should be. Work in triangles starting with the brighter stars and look for star patterns on the map and then see if you can spot the same patterns in the eyepiece at low power.
If you are using a Newtonian then the view in the eyepiece will match the star chart (rotate as needed). There is no reversal of the image.
Centaurus A looks like a hamburger from side on and is not too difficult but maybe fainter than you are expecting. Once you see it you'll wonder how you missed it.
Note your field of view with your 30mm/68deg eyepiece is approx 1.3 degrees in your 12"/1500mm 'scope.
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