Go to shoots, talk to cowboys about their guns. Try some out. They'll tell you anything you want to know. Important questions to ask would be:
How long have you had it?
Is it stock or has it been worked on?
Would you buy another? Would you buy a different brand?
Reloading problems? Reloading equipment preferred. You'll need to reload.
Are you a potential gamer, historical reenactor, gun collector or a weekend shooter? When I started out I went with the original Ruger vaqueros as I have big hands and shoot duelist, if your hands are smaller you might need a smaller revolver. Longer, heavy bbls in any gun tend to be slower to manipulate (draw, shoulder, sweep, move around objects) than shorter, lighter bbls. Are you recoil sensitive? All my cowboy guns are .45 lc, I shoot a decent load witha 200 gr bullet. I've been to a bunch of state and regional shoots, the best I've ever done were multiple 5th place awards at big shoots. I didn't need or want to put in the extra work to get any faster. Do you have the time, $ and drive to be an A shooter? .32- .38- .44 -.45? If you stay in this sport for many years your tastes will change, equipment and style will evolve, what you started with may or may not be what you end up with. I've done more experimenting with shotguns than anything else.
Good luck, have fun.