In an attempt not to have anymore pages printed out at a very odd looking 12 x 18,

I'm guessing these steps will get me 12 x 12 pages with two 6 x 6's at the bottom.
1. Open a new image and size it at 12 x 18.
2. After saving psd file [layout] as a jpeg at the highest quality possible................
3. Drag it onto the new 12 x 18 canvas.
4. Save two more as 6 x 6 highest quality possible jpegs and drag them to the
bottom of the strip.
Do you think I've got it correct now?
Thanks to info shared @ SBB I knew to choose 'no color correction' and the quality was great!
Thanks - Debra