I'm new to flying with kids I've flown alone before, but never actually flown on SW. I know I can check in online and print out a boarding pass... but I have young kids (6,4,1) so that means I can preboard right? will they give me a different ticket at check in? How do they line up preboards? Sorry for the stupid questions... but I'm a little freaked out about the whole flying thing to begin with, now I'm worried about us all sitting together...