Michael64,
There's a lot of opinions out there on this, so here's mine: Factory rifles(barrels) will require a LOT more effort than a custom barrel. 1) clean the rifle thoroughly, stripping the bore to bare metal. It is still dirty if brand new, BTW...
2) Give the bore a polish with JB Compound or similar. Flitz is a good choice. Use a bore mop and a good bore guide with a good cleaning rod to avoid damage.
3) Clear the bore of whatever you used with a good solvent and lots of patches, then dry.
4) Go to the range with your cleaning equipment and a good supply of ammo. If you handload, light-to-moderate work best.
5)Shoot one round, clean. Repeat 10 times.
6)Shoot 3 rounds, clean. repeat 10 times or as long as copper fouling shows.
This is a lot of trouble. Done carefully, it will have very good results.
Resolve to get a really good barrel that will break in in 10 rounds...
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The Bill of Rights, and the Golden Rule are enough for civilized behavior. The rest is window dressing. Shoot carefully, swifter...