Hi Ed,
For placement, based on the diagram.. I'd think you could put the 2 front speakers 3 or so feet to the left and right of the TV. These could be mounted in the wall or with wall brackets - ear height.
Directly across on the back wall you could mount the rear speakers with wall brackets. Hopefully there would be a surface to mount the right rear speaker between the window and stove... if not you could screw the bracket into the window frame. You could also use floor stands for the rears. Center channel could be above the TV and sub in a corner or mounted in the wall. I wouldn't put anything on the far wall to the right of the entrance. 2 cents.
B&W, Genelecs, Tannoy, JBL can cost a lot.