Because I lack at the moment the necessary artistic skills t I bought a book called Small & Chic Interiors to assist me in the designing process. After I thoroughly examined the book, I found a project that I really like and email the owner asking for the 2d drawings, which to my surprise he did (thank you if you ever read this :] ), helping me tremendously that way in the overall process.
Programs Used: Autocad, 3dsMax, UE4, Photoshop