Erm...
Well, I'm going to assume your problem is that you've signed 11 wonderkids but their preferred position is "GK". Check their "position" page on the player screen.
Unfortunately, FM07 doesn't allow you to play with more than one "GK", (a MAJOR bug in the game, sortitoutsi!) so you'll most likely be playing a few of those kids out of position. They're not experienced enough to do it yet, so you might need to bring in some reinforcements. I hear that "strikers" are particularly effective.
"Sweeper" isn't too far away on the field from "GK", so try playing three guys there - it shouldn't be so much of a change for them. Outside of that, I can't help you. Try selling a couple for some cash and buy some defenders or midfielders, then, if you can afford it, some strikers.
Do you have any "midfielders", out of interest, perhaps in your reserves? And what formation are you trying to play? What style of football? Have you read
this?