I want to migrate my one site built using EPiserver 4.62 into EPiServer 6 site. Please guide me what all steps are required to be done.
You need to upgrade your site to CMS 5 first. Then upgrade to 6. (Upgrade from 4 to 5 is the important and potentially difficult part) You can start by reading this tech note:http://world.episerver.com/Documentation/Items/Tech-Notes/EPiServer-CMS-5/EPiServer-CMS-5-R2/EPiServer-CMS-Migration-Tool-11/
As mentioned, you need to first upgrade from 4.62 to CMS 5 R2 SP2. When this is done, the next step is to upgrade to CMS 6. This blog post describes how this is done using the EPiServer Deployment Center.
Below links will help you in migrating website from 4.62 to CMS 5 R2 SP1. Then you just need to upgrated to 6 through EPiServer
deployment center. You might face some problems to find the exact replacments. Below links will help you.
And the blogposts: