Here is a topic with lots of links (also view the other posts in the topic as not everything is updated in the first post): http://forums.sketchucation.com/viewtopic.php?f=40&t=486 When you import an image and scale it properly so that it's at a correct size, it will be part of your model. Now you can use this plugin to quickly change a material applied on your model with another one in your "In model" library (obviously the one you have just imported). http://forums.sketchucation.com/viewtopic.php?t=9903 This is another one: http://forums.sketchucation.com/viewtopic.php?t=26013

Check your axes are set to the original axes. Perhaps you have modeled upside down ?

Don't take it the wrong way. What people are saying, is that although your question seems simple, the answer is not.

The PushPull tool only extrudes one face at right angles. To extrude a face along a path you can either preselect the path of joined edges, then use the FollowMe tool and pick the face so it's extruded in one step... OR have no selection then use FollowMe, and then pick the face and it lets you dynamically 'pull' the face along any suitable path that it finds, click to stop or it runs out of suitable path edges to follow...