Is there a way to create a checkbox directly on my spreadsheet but not
have the user have to use the mouse in order to check the box. I am
looking for a key board shortcut or a way to assign a key so that when
tabbing thru the checkboxes I can just hit a key and fill in the box

If you want to assign a key to the specified checkbox, then go into
design mode and select the checkbox's properties screen. Find the
Accellerator property and enter the key that you wish to use. After
you exit design mode, simply depress <ALT & your key and the checkbox
will activate or deactivate. Hope that does it for ya....