Chris welcome aboard! Well I don't need to tell you about your fist mistake, (using match light)! We all make mistakes! Like the Captain said you are looking at about a 6 hour cook for a 5lb rack of spares cooking with a dome temp of around 250, give or take a few degrees.
What the Capt. is referring to when he says "3-2-1 Method", you start off smoking the ribs for three hours, foil for two with a little liquid of your choice (juice works great) and the last hour unfoiled. This method works great for spares. I normally tend not to foil anything, but with ribs you almost have to in order to come up with a consistently tender,moist product. Good luck and let us know how they turn out.
BTW, do you fire your cooker the traditional way or do you know about the "Minion Method".