The following link is a great resource for learning how to use the board. It has all the commands you are likely to need. ESP8622 Quick Start Guide

The following link is a great resource for learning how to use the WiFi module. It has all the commands you are likely to need. The guide is written with the intent that the user will use the module as a standalone device without the Arduino, but at the end of the guide the commands given are all the same. This is the reference I use for projects like this. ESP8622 Quick Start Guide