I would also suggest you go with the .45ACP to start with. Handgun cartridges (with the exception of the few bottleneck ones) are much easier to learn on and require fewer steps.
I've been handloading for handguns for just over 15 years. I have yet to try my hand at rifle. Given the cost these days of .223 ammunition that is going to change this year. I just ordered a case of Wolf SMR primers, some rifle powder, and some 55 grain FMJ bullets. So, its time to see how it goes.
I started with a RCBS Rock Chucker kit in 1994, so I have everything I need to load rifle (trimmer, lube pad, etc.) except the .223 dies. Once my supplies and dies come in, it will be time to sit down with my reloading/shooting buddy and learn that skill (he has done rifle in the past, so I will have a teacher).
I just bought a Lee Classic Turret from Midway (when they were in stock), but I have yet to set it up (my shop is almost finished, no room in my current handloading area for it).
I figure I will start out doing the .223 on the Rock Chucker, then perhaps advance to the Lee Classic Turret once I get comfortable.
Anyway, again, I'd start with .45ACP if I were you. I generally suggest folks start on a single stage, but if you want the turret, I see no reason not to start there, its still not a progressive.