Questions: How do I scale the image?The pointy arrow thing in top right of tools pallet How do I bucket fill?Hold down mouse on the gradient tool and more tools pop up. Sorry, just switched viewing styles so didn't see...
I'm not sure on that one, but you could always use the selection tool to select a rectangle then paint bucket it black, duplicate, and adjust opacity.
There are a few ways but an easy way is double click the layer to open blending options. Click stroke set it to black or whatever color and inside. Then choose a size.
once you have the image finished and saved, right click a layer and select merge visible, then go to edi>stroke>inside and select w/e settings you want.