Yes. The quality will be affected. The meat will never be as good as if it were consumed freshly made. That does not mean it will be inedible, but freezing something does not improve quality - it merely extends the shelf life and prevents spoilage.
Yes, but I would use it (after thawing of course) within one month for quality.
Yes, you can freeze a cooked beef joint.
You can safely freeze sausage before or after it is cooked.
Yes you can, but it will take longer to cook as the meat is frozen.
You can safely freeze dressing before or after it is cooked.
Yes, you can safely freeze cooked kebab meat one time. Once thawed, it is unsafe to refreeze any cooked meat.
Yes, you can safely freeze stuffing, before or after it is cooked.
yes
Yes.
You can pretty much freeze any cooked food. That is the advantage of freezing. It is the best way to store foods.
Yes, you can safely freeze dressing (stuffing) before or after it is cooked.
Yes, you can safely freeze soup that contains cooked ham.