How can I check that all the installation has been done correctly and that the status of things is correct?
/var/log/cpanel-install.log is accessible from the Terminal interface in WHM and includes the complete log of the cPanel & WHM installation. Review the last few entries in this log file to verify the installation succeeded. Here's the command you can use from Terminal in WHM:
# tail -10 /var/log/cpanel-install.log
Here's an example of what you will see if the installation completed successfully:
[Date/Time] [ProcessID] ( INFO): cPanel install finished in 6 minutes and 30 seconds!
[Date/Time] [ProcessID] ( INFO): Congratulations! Your installation of cPanel & WHM [version] is now complete. The next step is to configure your server.