Need help in the OF like ragingstorm said. Neither Jones nor Stewart is gonna do much. Forget the SB, especially for Stewart. There has to be more out there than these two.
I would also be concerned with your bench. Castilla is a cast away and it doesn't look like Werth is going to be able to start the season anywhere but the dreaded DL.
You might be a little lite on SV, too. Now that I look at it, you don't have a lot of speed either.
If he is available, maybe somebody like R. Winn could help. He will get you some HR and some SB.
Just attack one area at a time. Good luck.