You can directly create invoice settings based on your nature of Business.
Step 1 : Click Settings
Step 2 : Invoice Settings under income tab Step 3 : Edit
Step 4 : Enable the checkbox relevant details.
(You can create additional Charges, Subtract Charges, For Invoice)
If you want Product Description, Tax, user contact , Address, Billed By to be Printed for in invoice, Enable the checkbox. Step 5 : Click save