Help with beating story

Will somebody please aid me in beating the game? Im on my first playthrough, I have modded guns and lvl 50 but I just want someone to talk to while playing and some cool senior advice. My GT is GunMetalFighter and would love someone with a mic, I would like to reach the last area so I can start running it to lvl up people. Again could someone help me? Im on the missions that have a required lvl for 20+