Hi Cas
Do not despair. This is what I recommend you do.
Go to www.weebly.com
Make yourself an account. You will see its dead easy to make web pages with weebly.
Go to your existing website and use copy / paste as much as possible and in this way make your web pages on weebly.
when you are staisfied with the result you've got on weebly, 'publish' the siet (it's a button)
Then contact M24/7 and ask them to change the DNS to point at your weebly site - this sounds difficult but is not.
It is no longer necessary to get complex software to make good websites, so panic ye not and keep in touch for help.