From the Drawing* Toolbar, click Autoshapes > Callouts
*If necess., activate the toolbar via View > Toolbars > Drawing
Select the callout you want, then draw it out on the sheet
Right-click on the callout perimeter > Choose "Format Autoshape'
This will bring up the multi-tab dialog for you to format to taste
And to quickly reproduce similar callouts which you have spent time
carefully formating to taste, just do copy and paste