I agree. My sub gets her pleasure from pleasing me. I am the center of attention, not her. It's different if you're talking about masochists and bottoms and a host of other labels we can attach... but the "submissive" gets his/her pleasure from serving the "dominant".
That said, hopefully part of your pleasure is derived from his/her orgasms, or his/her loss of control when bound, or whipped, or the look on his/her face when you tell them "good boy/girl" and it is in that manner that you both take something wonderful from the relationship.
But subs... serve.
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and... though some may think being "in training" sounds odd, but most will commend you for not walking in with a line like "I an inexperienced dom/me looking for an inexperienced sub." (...and the unsaid part "whom I can experiment on...")
and... I have many years of experience... and I'm "in training" too. Don't be surprised that when you feel like you know it all, you don't meet a new submissive, experienced or not, who 'teaches' you just how much more there is to learn. Just like any other relationship.