@Mintyy
Can I suggest reading the forums at MFP. They really are a lot of help.
I’ll warn you though, if I read correctly that you are fasting 2 days a week (as in no calories?). That will earn you a bit criticism over there.
The way it’s set up is that you plug in your numbers, activity level, and goal. And then track your exercise, then you eat the calories it tells you too. So if 1500 is your base, and you burn 200 calories by walking, then you eat 1700 calories. If you want to aim for a larger deficit or think your exercise calories are estimated too high then you can choose not to eat all of your exercise calories back.
If you have a predictable activity level (such as your walking commute) then I would choose the moderate or active lifestyle then only log unpredictable exercise as actual exercise.
I’m pretty new to MFP, so don’t claim to be the expert, and have never used anything like SW or WW, but I can’t imagine trying to figure out what group my food fits in and then counting it is any easier than just looking at a package, weighing my portion, and logging the number.
One thing I have learned with MFP is to the tool do work and follow the numbers it gives me. Within that daily calorie amount I get all the choices.