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When I was actively adding/reviewing, I just added to the core6k deck I had. If you want to change it up now that Anki 2 has easier multi deck support then do that. I just made sure to tag everything accordingly, that was the important part so I could remember the book I got it from. I also made a separate model for my personal added cards that included page numbers in case I needed to go back and look at where I got it. I mimicked the format of my core6k deck cause it was optimal to me.

I use cb4960's Rikaisama Firefox Addon and Anki Plugin to add new vocabulary cards with a single button press. I have rikaisama set up to save the word, its reading, meaning, and the sentence the word was in to a single, large vocabulary deck. When I read something, any words I don't know get saved to this deck, no matter what the source. My vocab deck also has a field for an image, but I add that manually if I think it's necessary and/or helpful.

If I'm reading printed material and I come across a word I want to add, I type the entire sentence into a text box like this one and then save it the same way. It's really easy to get out of control and add more words at a time than you can handle learning, so use with caution!

So that's basically it. I read something, add anything I don't yet know to the deck, make sure I understand to the best of my ability what was written, and move on to whatever reading material comes next. The vocab gets reviewed in Anki during the normal course of things and the sentence gives enough context to help me remember where the word was used and why.

I take the picture of the sentence with my finger pointing at it with my iphone. i look it up whenever the hell i feel like which isn't often so i have like a 1000 pictures right now lol. I can add 20 cards just from watching a ajapnese talk/variety show or reading the internet... so it's not that important that i look up all these sentences asap.

I don't think you shoudl go back to the book in my opinion because there's probably better books (enjoyability wise etc) or book that are of more value to you (that you just haven't read so you don't know yet). That's the way i look at it.