wut were the tuts about that u read?
the border wud be dope if it was measured a bit more (same width on both sides, etc.)
n tizz, u make scanlines like this...
draw two scanlines, space/rotate them as u like
then select it (make sure that it doesnt begin AND end wit a scanline or a blank), and save it as a pattern (edit>define pattern)

then apply them by using the fill tool, n changin it from foreground to pattern

there's an easier way, but every time i try it it doesnt work, so just do that