My suggestions for your fantasy team right now are as follows:
For quarterback, Peyton Manning. After only 4 weeks, he has thrown for 16 touchdowns, with 1,470 yards and a 138.0 passer rating with 0 interceptions! Not only that, but he's led the Broncos to a 4-0 record!
For the running back, Adrian Peterson. With 92 carries, he has piled on 421 yards in four games with 4.6 yards per touch, and 5 touchdowns.
For your wide receiver, pick Julio Jones. With 33 receptions, he has 481 yards, creating 14.6 yards per reception and 120.2 yards per game! He also has two touchdowns.
For your tight end, Jimmy Graham is your man. He has 23 receptions, for 358 yards and 15.6 yards per catch, with 89.5 yards per game. That's a lot for a tight end!
Then, you should pick the Chiefs defense. They've held their opponents to 41 points total, which is only 10 points per game.
I'm going to leave the wild card to you. Good luck!