Email Function in Excel

Hello,

I have created a spreadsheet containing Clients, invoice numbers, Due date for payment, Date reminder has to be sent to the clients and follow up. I would like to be able to have a reminder pop up n my PC on the morning the reminder has to be sent, also I would like to know if it's possible to attach a file to an email when sending from excel through outlook. I have the e-mail up and running, but I keep getting errors when I try to add an attch function into the code. It important that I get reminded the day before so I can update the spreadsheet and then I have to attach a copy of the invoice. E-mailing from a list on a spreadsheet works already.

Any help is appreciated.
Thank you.