• Choose FILE and PAGE SETUP
• About halfway down under the print heading, check the box next to ROW AND COLUMN HEADINGS.
• Now when you do a Print Preview you should see the ABC's and 123's. 
• Do the same to turn it off.

• To highlight the entire worksheet, click the corner of the headings (directly above the 1 and to the left of the A)
• Then you can either change the font on the formatting toolbar or ...
• Choose FORMAT
• Then CELLS
• Then select the FONT tab and you can make the changes there.

Highlight the cell(s) you want the lines around Select the arrow next to the borders button on the formatting toolbar. You will see this menu drop down with choices for the different types of lines you can put around the cell.

How can I uniformly change the width of columns or height of cells?

• Highlight the columns (by clicking on the letter headings and dragging) or rows (by clicking on the number headings and dragging) that you want to change
• Then adjust the width or height of one column or row by clicking and dragging on the line that separates the headings.
• When you have finished adjusting that one column or row, it will adjust all of the highlighted rows to the same size.

• Highlight the entire sheet (or just the columns you want to adjust)
• Double-click on the line that separates the column headings
• This will automatically adjust the selected columns to fit the contents of that column.