Hi, I may not be much help, some of these errors are not too hard to fix,
1) Required PHP Extensions there is some info here how to setup email piping so the ticket system will work:
http://docs.whmcs.com/Email_Piping
if you have already seen this let me know.
2) you may need to update curl, talk to your hosting service provider, tech support, they sometimes have neat ways of updating server-side software such as PHP, curl, and more. Sometimes latest software is on their servers but it has to be updated to run whatever version you perfer because not all types of website software like osCommerce are compatable with the latest versions of server side software due to osCommerce never updating their technologies like the rest of the world.
3)your hosting company can make the folder writable for you or it can be done on your servers control panel
4)its just a guess but, Ask your hosting company if they can show you a list of enabled and disabled server-side software and ask them if soap and xmlrcp are enabled on the server, ask them to enable it.