As others have said: Welcome to the Forum! The members here range from "just interested" to people who actually write the books that are considered the last word on Smith and Wesson firearms.
If you aren't familiar with firearms, here's some background: Your revolver is a Model 686+ (or Plus). That means it is a stainless steel, medium/heavy revolver that can use any .38 Special or .357 Magnum ammunition, and has seven (as opposed to the usual six) chambers in the cylinder. Those are the holes that you insert the loose cartridges into. To open the cylinder, push forward on the cylinder release under your right thumb and swing the cylinder out. That's enough to examine the revolver and check what model variant and serial number are stamped underneath.
This revolver has no collector value, YET. Someday, it probably will. Something to note: if you run a survey of gun owners as to what one handgun they would keep if they could only have one, THIS would be one of the top contenders. It can shoot anything ranging from cheap low-powered plinking ammunition to "boutique" hunting loads. It loads seven instead of the usual six. It's handy and fun to shoot. It will last forever. Smith and Wesson L-frames (like this one) are well-made and VERY accurate.
Even if you are not into guns now, get a locking case and put it away safe. It will only get more valuable. If you want to shoot it, get some instruction. Guns are almost as dangerous as cars, but once you learn to drive them, they are wonderful tools.
Hope this helps! Let us know how it turns out.