Ok , I am new hear, and need some help.

I just purchased a 14 classic in 308 win. with detachable box mag.

I now find out that I can change barrels??? That really excites me!!!

Questions:

1. I believe I have the short action, so what calibers can I change to?
2. Do I have to load single shot? if so what dictates that?
3. Is it really as easy as screw off and screw on?
4. What about head space?
5. Specifically I really want to convert to 22-250 and maybe 25-06. Can these be done?

This all seems too good to be true!

jimmy