I have an old cockerel I am cooking today. I took the breast meat off and used it for stir fries very thinly sliced with fresh garden veg and a bit of chilli and soy sauce
The wings and legs I marinaded by putting the pieces in a polythene bag, adding some oil and balsamic vinegar and lemon juice with salt and pepper, tying a knot in the top and moving it around a bit to get everything well covered in the marinade. Left it in the fridge for 3 or 4 days moving it about a bit every day so the marinade covers everything.
Today I have prepared some onion, fried the chicken pieces in some left over pork fat I had (you could use oil) added the onions, marinade and some fennel and celery stock I had made and frozen last season (you could use a chicken stock cube)
I shall simmer this gently for 3 or 4 hours, adding some sliced field mushrooms for the last hour.
When it is tender, adjust the seasoning and add a bit of mushroom ketchup if needed.
Sorry I don't have quantities as I have been cooking too long to bother,
but if you need more info I shall try and work it out