The first thing to do is to Sign up for our free 30-day trial and try out the features that we offer. You can go through our Quick Start guide which shows how to create a simple web application to chat with friends.
We have Learning OpenTok step by step walk-through tutorial and sample app to showcase how to build web to mobile interoperable application for video chat, archiving and text chat functionalities. If you want to build use case specific apps, we do provide pre-built Starter Kits with best practice implementation.
If you still have questions, post on our community forums.