Joomla Help to fix and add some things to my site

I am looking for help with my Joomla website. Issues I need help with are things such as: -When I post my news articles to my facebook page the images dont show in the post. I believe this is due to Facebook Open Graph Tags not being present. Can someone add that -I would like Facebook to be shown in a better spot on the site as noone uses it -I am not getting youtube subcribers as noone knows about it. How can that be done better on my site? - I dont have a XML Sitemap - I believe my editor is hard to work out putting the same size consistently throughout the whole site. Can that be fixed? -JavaScript Errors Mypage is reporting JavaScript errors during load. This could indicate that some required functionality on your page is failing or scripts may have coding problems. If you can audit my site and let me know what you can do to improve the above points plus anything else I will then look to hire you. I need you to show me some examples of what you think you could do better as well if you think it needs it. My website is [login to view URL]