VBA Commands For ActiveX Controls

I have made an Excel sheet that uses ActiveX controls (Option Box and Check Box). I have included a couple of screen caps at the bottom of this post to better explain the layout. Here are the specifics:

There is one Option Box Group labeled "InputOptionGroup" with choices labeled: "FirstOption", "SecondOption", "RefundOption" and "NoneOption".

Adjacent to the Option Box is a series of Check Boxes that correspond to the choice made in the Option Box with the exception of "NoneOption". The Check Boxes are labeled "FirstCheck", "SecondCheck" and "RefundCheck". Each Check Box object belongs to the group labeled "OutputCheckGroup".

I do know that the value of the Option Box choices and Check Boxes can be either True or False depending on if it has been chosen or marked, but I do not know how to incorporate these values into the action script. With that being said, here's what I'm trying to accomplish:

...when "FirstOption" is chosen, clear values of all Check Boxes and place a check mark in "FirstCheck".
...when "SecondOption" is chosen, clear values of all Check Boxes and place a check mark in "SecondCheck".
...when "RefundOption" is chosen, clear values of all Check Boxes and place a check mark in "RefundCheck".
...when "NoneOption" is chosen, clear values of all Check Boxes (no furthur action).

Also, there are a couple more requests:Is there a way to lock the Check Boxes from user input? I want the Check Box values to be altered only by the choice in the Option Box.
Take the "GPIN" field, the one on the right is locked from user input. This particular cell references user input from the "GPIN" field on the left. Is there a way to return a blank value when the input field is blank insted of returning a "0"? If you notice, all fields on the right reference blank values as "0".
In the left "Amount" field, I need to display a "$" followed by the value in the input "Amount" field