Hi there 99, jsut started my own thread about making chicken soup from the carcass!! I have to admit to buying ready packed chickens, which these days have the amount of time to cook on the label, so can't help there, but I usually just pour a small amount of oil over, to get the skin crispy, then sprinkle with a little bit of salt and paprika.
Gravy is really easy. Once you have taken the chicken out of the roasting tin to "rest" for ten minutes (not sure why, but I always follow instructions!) just put the roasting tin on the hob, on a medium heat. Once the fat/juices start bubbling I add the cooking water from the vegetables & potatoes, sit it all well then boil that up. Then mix some cornflour and water in a small cup, and slowly add that to the tin, to thicken. I also add a dash of gravy browning, put that's just for the look - it's quite pale otherwise. I then turn it down a simmer for a few minutes, stirring occasionally, while I get everything else dished up, and voila! easy peasy gravy! Added bonus is that this also helps to clean the roasting tin by lifting all the crusty bits off it. you could strain it - I never bother cos I love gravy with bits in.
Cooking the carcass is equally easy. bung all the bones, leftover skin etc in a pan, add some peppercorns, a bayleaf or two and cover with water. Bring to the boil, and then simmer for a couple of hours. I also usually add some roughly chopped carrot, and maybe some celery (my mum always did that!) Check on it every now and again, and add a bit more water if you're worried about it boiling dry. The carcass I'm boiling now also has a few left over cooked sugar snap peas added - I don't like waste!
By the way, I only cooked my first roast chicken about 6 weeks ago, and it's so easy I have done about 5 since then!!