You will need to learn how to load external images (probably
into a loader component), how to create a pre-loader, action script
such as Stage, _width, _height, onResize, about event listeners,
and other other little things. Tutorials for those aspects are all
over the internet.
For a start i want to just get the image scaling done. I
tutorial but i cant seem to get it working. Can someone post more
detailed in structions please?
i dont know how to do the actionscript correctly, i dont even
know what size i should make the new document.