message that the user has JS disabled

I want to prepare a message for my users in case he/she has JS disabled. First of all I want to clarify that I will not make the site work without JS(it requires considerable coding work.)

The question is OK...I detect that the user has not enabled JS. What are the next steps from there?What warning should I give him/her? Should I do anything else besides warning them? Redirecting them for example somewhere else or taking any other action for that matter. I really do not know how to handle this besides showing the message of course.