Please don't take this the wrong way -- sincerely, I am trying to help.
That revolver has the MOST value if you keep it and start shooting it. It's been my experience that Taurus made some of their better guns around this time period. Taurus has a well-earned reputation in this industry for the absolutely erratic quality and finishing of their firearms. When you combine that (deserved) reputation with the prices that Taurus revolvers go for new, right now at retail, that all adds up to give your revolver a fairly low "value."
I put the word "value" in quotes because we have to remember how this number changes dramatically depending on the situation. If you take that revolver in to a gun store to sell to them, you'll be horrified what they offer. If you don't believe that... try it and report back. Gun stores are in business and they have to figure what they might possibly sell it for before they can even consider giving you money for it. If you took it to them to trade toward something from their stock, the "value" would be a big higher.
The most you could expect to get for it would be in a private sale to someone who wants it. Consider your ability to make that sale and find that market.
And to wrap it up, I go back to where I said that it's highest value is to keep it and shoot it. While each Taurus can vary wildly in quality, I have found the revolvers from this era to be pretty darn good guns (at their price point) and if that one checks out well, it's a solid gun based on a very good design.
Obviously, being a .357 Magnum, it will happily digest any/all .38 Special ammunition on the market. If you buy some 125 grain .38 Special ammo, you may find that it's not all that intimidating to shoot, even for a new shooter. It's too large and bulky to be a concealed carry gun, but would be a fine gun to use for range days... to work on handgun skills and simply for the enjoy of punching paper or knocking down targets.
I am interested to know why you bought it new over 20 years ago and never had occasion to shoot it. It has never been a "collectible" gun and it's true value is as a shooter, even now -- or especially now.
I would choose THAT revolver over a new production similar Taurus revolver right now, in a heartbeat. To be traded in or sold, it does not have a high dollar value.
Attention Brass rats and other reloaders: I really need .327 Federal Magnum brass, no lot size too small. Tell me what caliber you need and I'll see what I have to swap. PM me and we'll discuss.