boy finds a simple ring that turns out to be a ring of power
There's a few possibilities, here's two of them
https://storiesonline.net/s/48686/the-dragon-ring
https://storiesonline.net/s/51823/ring-of-truth
you need some more details if it isn't one of these.
The most recent one that I can recall is Ring of Command by Ken Ghannon, which is still in progress though not updated this year.
Maybe Kenn Ghannon's Ring of Command:
https://storiesonline.net/s/72472/ring-of-command
or maybe even aubie56's A Fantastic Ring
https://storiesonline.net/s/70892/a-fantastic-ring
either one.