Here are some useful youtube links on creating a webchat website
https://www.youtube.com/watch?v=KrGfq0vXEkc
https://www.youtube.com/watch?v=LJyfhD5CUiM
https://www.youtube.com/watch?v=Fzv-rgwcFKk
https://www.youtube.com/watch?v=bB7xkRsEq-g
there are more search here
https://www.youtube.com/results?search_query=how+to+build+a+webchat+website