This post will give you a loadout that you can use with the Pick 10 system on Black Ops 2. This loadout will give you high damage but instead of using the standard SMG we will be using an Assault Rifle which gives you close to the damage but adds longer range.
Call of Duty Black Ops 2 High Damage Assault Pick 10 Loadout
You will find that if you want to use this loadout as a beginner it is a good one as you will be able to charge about due to the high damage and the increase range. This loadout will also work well on playlists such as Capture The Flag and Hard Point.
It also works quite well on Kill Confirmed as well. You have the Millimeter Scanner which will help you in alerting you of enemies that are hiding behind obstacles and walls. You could also opt for the Foregrip that will give you weapon stability and help if you want to try and spray people.
If you are on your last legs you have the RPG as your secondary that will definitely pack a punch. You have the Scavenger as well that will help with ammo and Hardline will make sure that you get those scorestreaks up to use Escort Drone, Lightning Strike or Stealth Chopper a bit faster.
This is a decent class to use on pretty much any map but it excels on the Team playlists.
You can see a selection of other Black Ops 2 Loadouts for different maps as well.
If you are looking for a complete guide to the multiplayer on Call of Duty Black Ops 2 with written and video guides you need to check out >> http://www.codblackops2guru.com/blog/call-of-duty-black-ops-2-guru-guide/