Hi Evangelos,
About the SSL issue, in this issue, you could hire an SSL expert to get help. Because it’s not covered our item support.
About the WHMCS bridge, WHMCS Bridge is a 3rd party plugin. If you have any question about its feature then please ask the WHMCS bridge team.
About your last question, in this issue, you need to hire someone else to customize the theme based on your needs and requirements.
Moreover, please learn more about our support policy (item support includes & not includes), here https://www.themelooks.com/support/support-policy/ before post a topic or ask a question.
Best Regards,
ThemeLooks Support Team