No problem with newbie questions, because we all were newbies once.
N8Man has an EXCELLENT thread on this.
Yes, you can reuse whatever is left over. Use a METAL can to catch the ash and crispy bits. then load it up again.
Dbl Bbl Smoker, UDS, ECB, Char-Broil gas grill & charcoal grills, SJ - Certified Moink Baller