Troubleshooting and fix issues: MySQL, Php and Joomla experience required

Looking for EXPERT troubleshooter to fix the following problems: BUDGET: $100 MAXIMUM # 1- Newsletters stopped working. Mail software has been installed. We have 4 automatic newsletters that are sent. None of them are working anymore. I suspect mail software may require configuration. In addition, self-activation email in one of our databases is no longer being sent. I suspect this is related to the issue above. # 2 – Records in one of our databases are longer displaying in the home page. This database is not corrupeted and it is working fine. #3 - Admin panel display error message when I log in. Error is related to Joomla. Warning: Cannot modify header information - headers already sent by (output started at /media/disk1/home/md/public_html/administrator/[login to view URL]) in /media/disk1/home/md/public_html/administrator/templates/joomla_admin/[login to view URL] on line 3 #4 - One of our databases have missing records/table or possibly a table may require to be repaired: Table \'md_joomla.jos_magazine\' doesn\'t exist SQL=SELECT count(*) FROM jos_magazine where Complete = \'Yes\'DB function failed with error number 1146 Table 'md_joomla.jos_magazine' doesn't exist SQL=SELECT * FROM jos_magazine a,jos_registration b where a.user_id = b.user_id and Complete = 'Yes' order by magazine_id desc LIMIT 10 #5 – Other: Make sure our registration works (self-activation email) – this is related to item #1 but this may be working. I need to check and do a test. # 6- Update URL’s from our “news” database.