guns

A .22 bolt gun is a good place to start especially if you want to look into long range later. Relatively inexpensive for the rifle way less expensive for ammuniton. I agree it'a a good place to start!

You can't go wrong with any of those rifles, but I would suggest thinking about what long range rifle you would get and try to get the .22 to match those controls as much as possible. That way you get the most out of your practice.

Scopes can be a bit daunting! 10x is pretty much the standard for magnification, but having it adjustable for more is nice too. Not so much for actually shooting but for target id or even checking your hits, though that isn't as practical with small .22 size holes. Most scopes will have more than just a basic crosshair, with markings measured in MOA or Mils. Either is fine, just research it and see what you prefer and stick to it. Oh, if your scope has adjustable zoom I'd recommend first focal plane so the reticle stays the same scale as the target no matter the zoom level.

Irons can be fun to learn but honestly it's bonus. If you do want to change it up from scopes and there are plenty of relatively inexpensive red dots like from Vortex or Holosun. If it was me that would be on a separate rifle like a Ruger 10/22, which is a popular semi auto .22

6.5 is a good and proven caliber for long range, but I'm not sure if it would be suitable for larger game like a moose, but using the right ammo it may not be an issue at all. That's would be fkr you to research and decide.