We enabled Live Agent and created an SFDC deployment, generated the few lines of JavaScript and provide that to our web-developers to add to the companies Web page. The Chat window does not appear on the website after our developers copy the deployment code and paste it on the web page where we want to deploy Live Agent.
 
For now, we would like to use the standard Chat and don't want to customise the chat window with pre-chat, post chat windows, buttons etc. Do we need anything else over and above the deployment script to make standard Live Agent work from our website?

From SF documentation we understood that we only need to "Create a deployment to host Live Agent on your website. Each deployment includes a chat window, which visitors use to chat with support agents."

https://developer.salesforce.com/docs/atlas.en-us.live_agent_dev.meta/live_agent_dev/live_agent_creating_new_deployments.htm

We enabled Live Agent and created an SFDC deployment, generated the few lines of JavaScript and provide that to our web-developers to add to the companies Web page. The Chat window does not appear on the website after our developers copy the deployment code and paste it on the web page where we want to deploy Live Agent.
 
For now, we would like to use the standard Chat and don't want to customise the chat window with pre-chat, post chat windows, buttons etc. Do we need anything else over and above the deployment script to make standard Live Agent work from our website?

From SF documentation we understood that we only need to "Create a deployment to host Live Agent on your website. Each deployment includes a chat window, which visitors use to chat with support agents."

https://developer.salesforce.com/docs/atlas.en-us.live_agent_dev.meta/live_agent_dev/live_agent_creating_new_deployments.htm