Here are a few tips i pasted for you hope it helps:
SECRETS FOR SUCCESS
I boil the chopped onion and celery for the stuffing in chicken stock with a couple of bay leaves tossed in. You can use canned or fresh. My local Chinese restaurant makes a really tasty chicken broth and that's what I use.
I retain the vegetable/chicken stock and cool and put into the refrigerator. All the fat rises to the top and hardens. Remove it. This will be the liquid base of the gravy.
I make my gravy in a saucepan not in the roasting pan. It's just easier for me. If you are a dedicated roasting pan fan...no problem.
I pour the drippings into a big measuring cup so that the fat can go to the top. You want a little fat but not a whole lot. A time saving tip is to put a couple of ice cubes into the drippings to separate the fat fast. Ice cubes won't hurt the gravy.
If I've got tasty crumbles in the pan, I deglaze. After you've empitied the roaster, turn the heat up. Once the pan is hot, stir in a little white wine or water and scrape off all the good tasting bits. Add this to the saucepan for the gravy.
In a cup or a bowl mix several tablespoons of flour with 1/2 C of the stock, COLD from the refrigerator. Use the whisk and make sure this mixture is absolutely smooooooth. Very important! This is the trick to lump-free gravy.
Put the drippings and whatever amount of fat you want...zero to 1/2 c depending on how much gravy you are making and how rich you want it. I add the remaining stock to the drippings and bring to a good solid simmer. In a nice thin even stream, add the cold flour/stock mixture to the pan. Use that whisk in a nice motion...too fast and it will encourage the starch molecules so break down too fast.