email triggers from dates in excel

I need to know the formula and/or codes to create a trigger on my excel worksheets to send email when an item needs follow-up. Can anyone help me with this task. The workbook was created on 97-2003 but the outlook program I believe is a later version. I am not sure if that matters but thought I would mention it. Thank you.

I actually would love it if someone could help me create the macro so that I can create the email triggers. I am new with this company and have been asked to help them achieve this but I really have never programmed anything like this before nor have I created a Macros. I can understand simple programming and once I understand what I am looking at I can create but right now I am at a loss. I am enclosing a copy sample of the spreadsheet I need the Macros attached to (I will need to know how to create/run macros with my spreadsheet. What I need is an email triggered to the sales rep based on the follow-up date. The email should include the quote number and customer name. Any help is greatly appreciated. Thank you