Installing Drupal

Help me I really want to install drupal, but I keep getting this error, even before logging in and I have no idea what is wrong.

Warning: Cannot send session cookie - headers already sent by (output started at /home/mrgolden/www/www/tracking/drupal/includes/conf.php:43) in /home/mrgolden/www/www/tracking/drupal/modules/user.module on line 5

Warning: Cannot send session cache limiter - headers already sent (output started at /home/mrgolden/www/www/tracking/drupal/includes/conf.php:43) in /home/mrgolden/www/www/tracking/drupal/modules/user.module on line 5

On moderation, the docs say this:

Anyone with a user account will be able to moderate comments. This lets people assign a score to a comment on how good they think the comment is or how visible they think it should be.

Do you really mean anyone? Or is there a way, as the site administrator, to tweak that? This is the 'who moderates the moderators' question? If the flamers and trolls are themselves abusing the moderation system, is there a way to stop that?

I have several different types of clients, we all work in the same industry but different aspects or levels, example some clients are retailers, some are wholesalers and others are manufacturers. Can I set what each group sees using permissions and roles and if not how can I do this?
Keef

Say if I need to dynamically insert some known node's content at place (table) on a [site page]? How could I do it?

'm getting the message below in Watchdog and really can't find any reason for it (PHP novice):

Type: warning
Date: Sunday, December 01, 2002 - 03:19
User: [Admin User]
Location: /drop/admin.php?mod=watchdog
Message: No valid themes enabled.
Hostname: n/a

I'm using Apache2, mod_php4, on FreeBSD 4.7-Stable
Drupal 4 in it's own Directory httpd.conf directive
Straight tar -xvzf of Drupal tarball
MySQL running on a different machine
conf.php changed to reflect MySQL location

I can't get search to work.
I'm using drupal 4.0, but I upgraded search.module to 1.27 via cvs.
I've gone through all the admin menus, I enable "administer search"
and "search content". I search on a single word. I always get "no results".

when I display modules in the admin menu and click on "admin" in the
search module entry I get a blank page. Before I upgraded to 1.27
I got a page with a clickable link to "re-index" the database. Now I get
nothing. I was looking at the source code, but don't see anything obvious.