Verified answer

You really can't do much when your offline cause most of the option for Halo 4 is linked online. The only option to fight against the bots is Spartan Ops (which is technically fighting wave and wave of enemies while completing objectives), but you need to be online. When your offline, the only option is Campaign, forge, and custom game by yourself (unless you have someone to play at your house).

Sadly, no. It would have been cool to have such a function, since many players who are new to the Halo franchise may want to get better at aiming and strafing.

you can play on system link, basically wireless but people need to be in your range

No i am so very sorry.