Ok, you've got your team. You might want to do some trading off the gate. It wouldn't hurt to aim for players such as Kyle Schwarber, or Kevin Pillar. When you do trade however, make sure you aren't giving the opposition any big weapons. I did this in one save and it cost me big time (although it did give me some good pitchers)

Be tactical with your game strategy. Don't just hit and pitch the ball. Watch pitches, kinda let the game come to you. You have total control about how the match turns out.