I have many ways to control 4 aces on top but what I would like to do is present four different, fancy, and easy(ish) to learn flourishes for each production of an ace. Could anybody point me in a good direction please ?
The Royal Road to Card Magic does not contain flourishy methods of producing the four aces. I suppose the method contained in Decksterity by Harry Lorayne is as good as any. I can also recommend the method in Paul Le Paul's excellent book on card magic.
However I would also counsel against too much of this sort of thing. Flourishy handling can be a detriment to your work if you are not careful. This is because by emphasising your skill too much you dilute the effect your magic has on people because they will simply shrug their shoulders and say "he's clever with his hands"
I am always a bit alarmed at the fact that it is always the younger magicians who go hell for leather with flourishes. They get a trifle too excited and could dilute the effectiveness of their magic if they are not careful. I suggest that if they moderate their approach to this then the results will be better.
I am not against flourishes. Indeed I do them myself. However I am well aware that I am treading a dangerous path with them and I am careful to do them at the right time and for the right reasons.
I remember seeing Jay Sankey perform what he called a surfboard revelation with a spread. I'd say that's a form of a flourish. I think it's in Revolutionary Card Magic. not sure though.