As one who has played this game longer than most... I've seen people struggle with their decisions over whether to play... and what guns, accoutrements to buy. Decisions that are VERY important to the overall expenses and even the enjoyment of the game... when such person has so little information about how to make good decisions in relation to what guns and gear to buy. I can't begin to count the number of folks that have spent so much to end up either spending 2-3 times as much as their original investment in trying to MAKE their original purpose work, or swappin' out nearly all the firearms to better ones.
While a case can be make to just "buy and shoot", unless you're very knowledgeable about single action revolvers and lever action rifles, understanding what makes them work, and what hinders their true potential, this is really a "are ya fellin' lucky" proposition.
Ergo, buy once, cry once... and the BEST way to ensure that this holds true is to attend a match or two at the local level, and ASK questions of those in attendance. You will need to put yourself out there, no need to be a wall-flower, one thing we all hold in common, is that one time we were all NEW. And, we either gained the knowledge thru help from others, or spent untold hours studying the sport. Take the easy way, introduce yourself and ask questions.
TN Mongo gave you a couple of great pieces of information. Use it. Welcome to the insanity!