The best idea is to talk with a wood specialist in your area. Architect or contractor etc.

First, I would ask the builder to give you the dimensions of the furniture used in the plan. Since they've already done the legwork-you will know which pieces will fit. Many times folks go the the furniture store and end up with a huge sectional and it over powers the room. Second, just get what you love! You have to live there. Start to create an idea book in Houzz. You'll start to see a pattern. Then just find a sofa like the one in your pic that is in your price range. Just keep repeating until you have all your pieces. Same thing with wall decor (which I would do last). Have fun!

A large piece of art would look fantastic! Just taking a guess but is your home mid-century modern? I love your unique furniture!

dear aarti, you need to give the plan of the plot including detailed survey of the slopes etc. along with the same, you need to give the budget. i am sure there are many architects on houzz who can assist you for this project