“… I did not know that some people sell their dishes. Last year I put mine away and used disposables (silverware too).”
My understanding was always that they sell the chometz on the dishes and not the dishes themselves. I don’t think you have to do this, but that is a question either for your LOR or the Rabbi who is selling your chometz for you.
Either way though, you still can’t use your chometz dishes on Pesach and you have to put them away for Pesach.
So it sounds like you did the right thing last year.