I think it would be hard to make plans for shelves etc.. Because, everyone has different size items and different items they want behind their bar. There are general ideas to view on this site but, to add dimentions that would work foreveryone’s needs would be impossible.
Just look at the items you want behind the bar and make a diagram of where you think each thing should be. You then can measure the height and width needed in each portion. You can even use adjustable shelving to change and move items if needed. For that matter, you could even make the vertical walls seperating each section portable by securing them in place with small “L” brackets only.