Dating etiquette

So..... I just ended a 20-yr relationship and starting to date... it feels all new to me since even before this last relationship, I didn’t date a whole lot. But now men just seem to come at me from everywhere 😅 So I’m now kind of seeing 2 people casually.... neither is exclusive yet, but they both have potential.

how long have others gone before making one “official”, and how do you tell the others that you have to stop seeing them??