Design Living Room Color Scheme

Help me with my colour scheme for my living room/lounge?
Basically, the room is 25ftx12.5ft, and I dont want it to seem like a corridor. I’m thinking of getting a Walnut hardwood flooring, but would it make the room look small?
Also, any ideas on how to do the walls? I was thinking the two long walls and the end wall with the big window could be white, and the other short one with a patterned wallpaper? My sofas are black and I’m either going to buy a walnut or black gloss sideboard. I want the room to look modern/contemporary. However I don’t have much knowledge on colour schemes, interior designing etc so any tips?
Thanks in advance!
Treat is as 2 12×12 rooms. Designate a tv area with an area rug. Couch chair perhaps coffee table. Another area rug for either a nice reading area, couple of chairs and sideboard or wll unit. Do not put all of the furniture flush against the wall, angle chairs out
Colours should be to your taste
Possible Color Scheme for Living Room