I’m no kind of expert at all on it, but it really is pretty easy, Helen. Definitely go for “dry scallops” not the “wet” kind that get water and sodium tripolyphosphate added to them for preservation - you’re paying for the added fluid weight and it makes them more rubbery and soapy-tasting.
Really hot pan is the way I do it, with a little olive oil and butter. Make sure the scallops are pretty dry - I put them on a paper towel and pat/rub them all over to get rid of the water. Same as for meat, being more dry means a better sear. Salt and a little pepper right before I put them in the pan (don’t want the salt on for a long time, removing moisture). Once in the pan, I salt and pepper the other side.
90 seconds to 2 minutes per side. Bigger ones need the longer time. Into the pan they go, then really soon you’re turning them over…