You can control how many worksheets appear in new workbooks you create. If you always use workbooks where each worksheet represents a month of the year, change the default number of worksheets to 12!
Making sure your data is easily readable is one of the best things you can do for your colleagues. Be sure your worksheet columns and rows are roomy enough to accommodate your data.
Remember that you can add or delete individual cells from a worksheet. Rather than go through a lengthy cut-and-paste routine when you forgot to type a cell value, just add a cell where you need it.
If you add a graphic to your worksheet, you can change the graphics size and appearance using the Format Picture dialog box.