Although everyone has sound advice, I think that for sensible reasons, I agree with Shotgun Franklin.
I started with what I could afford ... I got a great deal on a pair of immaculate Schofields ... such a deal!
Then I got another package deal on a post '64 Winchester 94 in .45 Colt and a an old and well used Baikal Bounty Hunter.
The Model 94 has been retired from active shooting ... maybe a pig hunt of two. The Baikal is currently at the gunsmith getting work done on it.
The point is that the guns got me out shooting on a financial level that I could afford ... and later the Model 94 was replaced with the Uberti/Cody Conagher Model '73, and the shotgun I am using now is a Cap Coyote Norinco Model '87.
But the point is, like Shotgun Franklin's post, all these weapons were bought from active shooters and were first discovered at club shoots or through club members.
So go out and shoot those .45 revolvers, and post a link with the club that you want to beg/borrow/steal (only kidding about the steal ... *S*) some long guns so that you can try them out. Then, when you know what you want (For instance, barrel length, pistol grip or carbine, type of round, etc), you might run into a really good deal on those long guns ... for instance, I ran into a pair of SS 5.5 Ruger Old Armies with a bottle of powder, 100 rounds of bullets and all the tools for $700 for the pair ... some one was retiring from shooting and took sympathy, and gave me the deal of the century.
Then, once you know what you want, start looking around at the ads on the club bulletin boards ... and let club members know what you are looking for. In one of my 'finds', the member had four pistols and hadn't even thought about selling two of them until I said I was searching ...