This is a school homework I had to do :
The walls were imposed as well as 10 type of objects in the scene (like the desk for example) I had to add another 10 objects "minimum" to the scene and give it a purpose (I chose to make it into an otaku room but it could have been a kitchen, a fablab or anything else) ^^
Haha
Just take it step by step, each object taken individually is not that complex (sometimes they are even very basic like the TV on the right --> almost just a simple cube). ^^'
Patience is key and with practice, you go faster.
teach me how to make it, thanks