1. It's a great start. I'd cut the canned fruit. Get fresh, in season fruit. And deli meat isn't great-wild fish/seafood, grass-fed beef, bison, pastured chicken-all much better options. But you need to do what you can afford.
2 & 3. Yes, sounds like a detox reaction.
4. This will vary for everyone, I think a couple of weeks in I felt better, slept better, had more energy.