Modifying The Invoice

[blueinferno2001]

Hi,

 

there are some modifications I'd like to perform regarding with the invoice template:

1. I need to modify the default invoice paper size into half of A4 paper size. So when I click "view invoice" or "generate invoice PDFs" they will be print ready in half A4 paper size. The current paper size is either letter size or A4. Which part I need to set up or code I need to modify?
   
2. How do I make invoice number to reset automatically everyday? Which setting I should set up or which code I need to modify?
   
3. In which part of admin area I can display the invoices for a particular day along with each of their amount of payment? For example, there are 3 invoices for Feb 22nd 2013 and I'd like to display invoice 1, 2, 3 in one page with their own amount of payment and payment grand total for that day.
   

Thank you kindly for your help