You haven't provided much information, so it's difficult to provide a detailed answer, but here's the short answer:
Back up your document root directory to external media, then import it to document root on the new server.
If you have an SQL database, export the database to external media, then import it to the new one. It might be a good idea to do a
check, repair, and optimize on the database first.
A web search for "
migrate website" turns up many detailed articles and posts.