Email Template in Craft Commerce I have created a site for searching nearby restaurants and order items.

After ordering I wanna send a mail "Order received" with receipt attached in mail (if possible) to the customer + a mail to the respective restaurant which is in Craft->User "New Order" + a mail to site admin contains customer info and restaurants info + what I code in email template. 

All these function will be done in single click. I mean when customer click on Order Now. These all mail will sent.

I am try to search email template and tutorial but I haven't found anything.
Let me know if anything in this help document needs clarifying: https://craftcommerce.com/support/sending-an-order-confirmation-email