Well, the way i see it, if you're brand new, invest in yourself and get yourself a decently accurate good value 22 rifle. Use the hell out of it, go to structured shooting sessions, learn the fundamentals and practice. The 22 ammo wont kill your pocket book and you will build a solid set of skill. As you learn more, you can decide on what direction you want to go from there. If you make the jump to centerfire rifles, you will be starting there with amuch better core skill set and it will have been acquired much more cheaply than what it would have cost you out of the gate shooting center fire from day one. You may decide to go get yourself a much better rim fire, or, several. Or, you may decide to branch into handguns & if you do, go get yourself a 22 handgun to start there & do the same thing again - lern the fundamentals on the cheap first.
I know that its helped me greatly & saved my wallet hugely. I shoot two different 22 handguns a lot and shoot my 9mm relatively sparingly. Yes theyre not exactly the same. Yes, managing the recoil is not the same. But, grip, muzzle control, sight picture, transitions between targets, working on my draw & reloads is all close enough for where my skills are at that it doesnt matter that much. Eventually when i get to the flatter part of the learning curve, ill probably shoot the 22s less and the 9 more, but, for now, I dont yet need to and im still finding rapid improvements in my 9mm shooting even though i shoot it sparingly. For me, ill typically put 300-400 22 rounds down range followed by 50-150 9mm to finish.
How much have things improved for me since last fall? When i got my first 9mm - a used M&P pro from the EE, i posted looking for some advice and a gunsmith to see what was wrong with it. At that point, when i was shooting dot torture from 3 yards, i was having more misses than hits and was very frustrated. With practice & some coaching/help[ from a couple of other CGN guys im now knocking on the door of getting my first clean dot torture - haven't done it yet but typically only have one round getting away from me & at the same time am finding im able to do it all much faster and have seen a pretty dramatic improvement in my IDPA scores at the same time.
Might not work for you, but, it sure has worked for me.
Good luck!