PHP+Joomla help

If anyone can help with some simple PHP issues inside of joomla let me know. Ill pay you to help me fix it. Unsure what happened, as i havnt changed any files in months but all of a sudden im getting this in the header.

Warning: Cannot modify header information - headers already sent by (output started at /home/content/s/t/e/steelejones23/html/index.php:2) in /home/content/s/t/e/steelejones23/html/includes/joomla.php on line 698

Warning: Cannot modify header information - headers already sent by (output started at /home/content/s/t/e/steelejones23/html/index.php:2) in /home/content/s/t/e/steelejones23/html/index.php on line 251

Warning: Cannot modify header information - headers already sent by (output started at /home/content/s/t/e/steelejones23/html/index.php:2) in /home/content/s/t/e/steelejones23/html/index.php on line 252

Warning: Cannot modify header information - headers already sent by (output started at /home/content/s/t/e/steelejones23/html/index.php:2) in /home/content/s/t/e/steelejones23/html/index.php on line 253

Warning: Cannot modify header information - headers already sent by (output started at /home/content/s/t/e/steelejones23/html/index.php:2) in /home/content/s/t/e/steelejones23/html/index.php on line 254

Warning: Cannot modify header information - headers already sent by (output started at /home/content/s/t/e/steelejones23/html/index.php:2) in /home/content/s/t/e/steelejones23/html/index.php on line 255

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/content/s/t/e/steelejones23/html/index.php:2) in /home/content/s/t/e/steelejones23/html/templates/rt_synapse/rt_styleswitcher.php on line 4

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/content/s/t/e/steelejones23/html/index.php:2) in /home/content/s/t/e/steelejones23/html/templates/rt_synapse/rt_styleswitcher.php on line 4

Can log into the administrator any longer either…

If interested and if you can fix it quickly get in touch with me via yahoo messenger at kvhc_cwarman

Thanks