Ok...your pitching could probably use an upgrade. Hernandez could pick up a fair amount of wins if he stays healthy just because he plays for the Yankees. Sheets should be solid, hope he avoids the sophomore slump..and Suppan...well...he's Suppan.
Those last two could end up giving you more losses than wins, although Sheets could slide slighty above .500 if he pitches really well and they find somebody to close games.
You get 8 players...is there like a free agent list you can select from or it is like a salary cap game where everyone has a value and you have to keep it under the cap?
I'd start by fortifying your pitching staff. I'm a big, big pitching homer when it comes to fantasy baseball. I always try to get guys who will be reliable for me on the mound every time out and try to build solid hitting around it. With losses giving you a -15...you might be better off taking an average fourth or fifth starter from a really good team over a average one or two from a team that won't win many games. Also, if a save's worth 30 pts and there aren't any decent starters..you might want to try getting a closer. A good closer will get twice as many saves as the best starter will have wins. I'd only go after a really reliable closer though, as any runs he gives up will really hurt because he doesn't pitch as many innings.
Don't kill me if this doesn't work.
It's harder to play fantasy baseball than almost any other fantasy sport. I'm always tinkering with my team to see what works best. I usually end up doing pretty good though.