Act 1 - "F.N.G":
This is the first mission of the game, and serves as a brief tutorial. You will practice several methods of fire between your primary and secondary firearms. Afterwards, head back where you started to the door to automatically open it. Head right, then forward a few buildings down where the objective marker points. Head inside, then to the right side of the scaffolding and climb the ladder. You will be asked to run an obstacle course. Make sure to take advantage of auto aim to hit targets quickly and accurately. The less targets you miss, the larger bonus number of seconds will be deducted from your final time. Repeat the course as many times as you wish, and then head back over to Cpt. Price to complete the mission. Don't worry, you can manually change the difficulty before the next mission.
Feel free to ask any questions, and add me on TT/ TA/ PSN/ XBL as Danokitty. Happy hunting!