1) is it necessary YES
2) how to do it properly - BY SHOOTING YOUR RIFLE.
When you get your factory rifle, clean that bore like you will never do it again (and you will not). There can be a super strong rust preventative in the bore and you MUST get this out before your first shot. think bulged barrels.... bad kharma.
Bed that action properly in that stock. EVERY savage factory rifle needs that TLC.
Then shoot it working up loads. Most factory barrels are going to copper - some more then others. As you send some rds down range, the urge to clean will hit so clean. When the patches are a light grey, shoot some more.
If you get copper, guess what, you have a factory barrel.
Shoot, clean when you must, shoot some more. Enjoy
Jerry