Procedure To Send An Email Reminder Help?

Hi guys,I hope somebody can help as I am trying to write a procedure in SQL that will be an email reminder sent to users on every 5 th or the month if they don't submit data before.

I am quite new to sql and procedures in particular so I was hoping somebody can help.

I need to:
1.Check the day of the month, if not 5th do nothing

2.Get the date of the prevoious month (get current date - 1 month,set day to 1)this is the funny bit.
I have a field DateEntered,but users only select the month and the year on the acctual page,but when submitted it gets written as a full date and defaults to the 1st of the month.

3.Get the list of hospitals that haven't got data for the previous month

4.Email the hospitals.

DECLARE @returnDay int;
DECLARE @DateEntered datetime;

SELECT @returnDay = DatePart(day,GetDate())
If @returnDay = 5 (syntax error near 5)
BEGIN
SELECT @DateEntered = GetDate() - 30
Print DatePart(month, @DateEntered)

I was hoping somebody could look at this and help me.

thanks