Adrian Try writing on sitepoint has published a useful article “How to Migrate Your WordPress Site to A New Hosting Provider”. The article includes links to other useful posts.
Before attempting to move your site, make a full site including database backup
The article covers migrating your WordPress site to a new hosting provider in a three step process:
Transfer the WordPress files, including WordPress itself, your themes and plugins, and your media files.
Migrate the WordPress database that contains your posts and comments.
Reconfigure WordPress to work from the new server, and also update your DNS records to point to the new host.
Read full article: https://www.sitepoint.com/migrate-wordpress-site-new-hosting-provider/
