Hi:
Not sure that I get exactly what you are trying to do but if you want everything on one page and you have indicated that in your Page Setup then the only reason I can think of that it may not be printing on one page is that you might have a Print Area setup (wither on purpose or accidentally). Save a test copy of your spreadsheet and try this:
1) Make sure your Page Setup is set how you want it
2) Click on the box in the upper left corner (to the left of A and right above the 1 is a Blank square). This will select your whole sheet
3) Now select File\Print Area\Clear Print Area
4) IF you do not see Print Area under file you will need to hold your cursor over File for a couple of seconds and the option should appear.
If this doesn't get it working for you then post back with more detail
Good Luck,
Mark