Daily Invoicing Of Orders

I am trying to Invoice all of the records in my 'Orders' table. After each of the records has been invoiced I would like SQL to flag that record as having been completed so that when I run my query the next day it will ignore those having been completed already. Any feedback would be greatly appreciated.

This is the query I wrote to invoice one Order at a time by specifying each Order_Num seperately. As you can tell...I'm a n00b. Thanks all.

select convert(varchar, getdate(), 107) as Date
select order_num as 'Invoice No.' from orders
where order_num = '20009'
select c.cust_name as Customer, c.cust_address as 'Street Address',
c.cust_city as City, c.cust_state as State, c.cust_zip as 'Zip Code'
from customers as c, orders as o
where c.cust_id = o.cust_id and order_num = '20009'
select oi.order_item as 'Line Item', oi.quantity as QTY, p.prod_name as 'Product Name',
oi.item_price as 'Sale Price', oi.quantity*oi.item_price as Total
from orderitems as oi, products as p
where oi.prod_id = p.prod_id and order_num = '20009'
order by oi.order_item
select sum(quantity*item_price) as Subtotal, sum(quantity*item_price*.089) as 'Tax 8.9%', sum(quantity*item_price)+ sum(quantity*item_price*.089) as Total
from orderitems
where order_num = '20009'