You certainly DO need help andreasfreeman!
Have you determined which walls are bearing?
If not, I suggest you talk to an engineer first. So you know.
Looks like the existing dining room could have been added on.
The existing kitchen looks like it was a porch at one time.
If it were my house, I'd be wanting to move or remove all of those walls separating the spaces. That's why the engineer is critical.
Can you explain why you are committed to the dining room (DR) remaining where it is? Is it all decorated? You are boxing yourself in and limiting your options with that decision.
Again, if it were my house, I'd place the living room (LR) where the DR is now, perhaps adding to it the existing kitchen space up to the existing LR wall.
Then I'd place the new kitchen where the spare room is now, expanding the space over to align with the wall now separating the LR and Kitchen, and make the existing LR into the DR. Probably with no wall separating the two rooms and an island with an eating counter forming the separation.
The only wall that would remain in its current location would be the one between the existing Kitchen and LR, and that would have a very wide doorway in it. If you wanted doors to close off the LR from the DR, you could have french or pocket doors.
The remaining jog at the top of your drawing that is now part of the Kitchen would make a nice closet for the LR.
Good luck with your project.