A .357 magnum revolver is fine if you ever plan on shooting .357magnums. If not then a .38sp revolver will be lighter and may balance a little better in your hands.
Consider adjustable sights as they allow you to change the sight settings as you use different power levels of the cartridge. Also they are bigger and easier to see which helps out a new shooter.
If you get something like a S&W M15, a blued 4 inch .38sp K-frame, then you can also get the matching M18 which is a blued 4 inch .22lr K-frame and not have to learn anything by switching back and forth shooting them.
Consider adjustable sights as they allow you to change the sight settings as you use different power levels of the cartridge. Also they are bigger and easier to see which helps out a new shooter.
If you get something like a S&W M15, a blued 4 inch .38sp K-frame, then you can also get the matching M18 which is a blued 4 inch .22lr K-frame and not have to learn anything by switching back and forth shooting them.