you cant draw curves in 3d space, well, u can, just draw a curve, change to persp view, middle click drag to move the CV/EP in 3d space, but thats the only way to do it

to make a curve movable, just draw the curve and hit enter but it wont render so you would need to use more curves and birail, extrude, etc etc

to post an image, all u nd to do is hit print screen (next to scroll lock) go into a photo editor (or paint if u really want! ) paste and save easy peasy