My advice is worth every penny you pay for it.
I'd suggest a used S&W Model 10 or Model 64 revolver in 38 special with a 4" barrel. These two models are twins, the difference being that the 10 is blued and the 64 is stainless. These are readily available in good condition and reasonable cost on the used market. They handle extremely well and are easy to shoot accurately. The 38+P cartridge is a good load for self defense, if that's a consideration.
All of the above are the reasons that this revolver was the sidearm of choice for most US law enforcement agencies for half a century. And they're still good reasons for us regular guys to own one today. I have several and I always grab one when I'm going to the range or plinking.