Primary Weapons: You can start with BR, DMR, Carbine, Assault Rifle, and Storm Rifle.
Secondary Weapons: You can start with Magnum and Plasma Pistol.
Grenades: You can start with Frags, Plasmas, and Prometheans.
Perks: You can have Thruster Pack, Hardlight Shield, Jetpack, Auto-sentry, and I think that Hologram was mentioned.
Packages: You choose one and it helps you by befitting your specific playstyle. There is one called Firepower that allows for two primary weapons, one called resupply that allows you to pick grenades up, ect.