You might check out "Dottie's Weight Loss Zone" it is one woman's Weight Water page, but she has an entire section (we are talking enormous) on the "points" for all resteraunt meals, that are a chain.
www.dwlz.com
I am pretty sure she includes calories, etc. If she doesn't you can assume that for a single meal you should try and stick to 8 or 10 points at the TOP end of the point value.
When I did weight watchers, my point allowance was about 20 or 25 for the day. I usually reserved 1/2 of that for dinner.
{1 point is approximately 50 calories, but you have to add or subtract for fat (add 1 pt for every 12g of fat) or fiber (subtract 1 pt for every 5 gm of fiber).}
This helps me whenever we eat out.
You will do well ordering things without mayo, cheese, or the other obvious things. Some of the salads are ok but ask for everything on the side and then get the lowfat dressing. Good luck resisting the french fries ;-) That is probably the biggest hurdle.
Wendy's has plain baked potato and their chili is good and low points as I recall, if you have a sway.
Jen