maybe purchase a book (sorry not maybe, sure...).
https://www.amazon.com/Ragozin-Complex-Vladimir-Barsky/dp/9056913700/ref=sr_1_1?ie=UTF8&qid=1464856919&sr=8-1&keywords=ragozin+chess
I don't know it but Barsky has a good reputation as an author.
If u prefer video mode, maybe this one :
https://www.amazon.com/The-Ragozin-Defense-Alejandro-Ramirez/dp/3866814623/ref=sr_1_2?ie=UTF8&qid=1464856919&sr=8-2&keywords=ragozin+chess
I don't know it neither (Ragozin is unknown territory to me), but Ramirez made awesome work on Benko gambit on the same format.
Don't expect anyone (almost) here to learn u something, u'd better purchase book or video which will be more informative, much well explained, and u will not read some incorrect things...
Hi, I have recently made the decision to start playing the Ragozin Queen's Gambit Declined with Black. Does anyone know typical middle game plans in this varation?