| Sandbox does not mean you need to write your own adventures. It is more about presenting a world for the PCs and letting them choose where to go. You can say this is White Plume Mountain or this way leads to the Steading of the Hill Giants if you want to. Just let them decide what they are going to do. And it is not hard to alter the plots of most modules and the goals to fit what the PCs do.
It is more work for me at the beginning as I lay the ground work and come up with ideas for where they might go. But once the campaign gets going the PCs start making choices that build on past choices. Unless your PCs are ADD or something I've found that it becomes easier to predict what the PCs will do.
No, I wouldn't. A new DM will have problwems when the Pcs want to goto a place they haven't thought they would. | 
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