module uploads create massive error messages

Hi dear drupal community!
6 days ago I though, moving from joomla! to drupal would be a great step forward for me, since I focus myself on creating a community page! But until now, I wasn't even able to create a title for the website, since I firstable was trying to upload and enable some modules. Just as the first day, I get attacked from drupal with error message, and system failures. My hosting account made first place last year, and this year. It's fully support drupal, and joomla! So it shouldn't be the servers fault. Server is using Fantastico for automatically installations.
After hourlong researches on your forum, and additional recommended modules, I already was forced to reinstall drupal 3 times! I'd like to display below some of my worst error events, I experience right now:

1st. after enabling some modules, an error message appeared, saying:

" * warning: Invalid argument supplied for foreach() in /home/latincof/public_html/includes/common.inc on line 3292.
* warning: Invalid argument supplied for foreach() in /home/latincof/public_html/includes/common.inc on line 3213."

2nd: (Please note, that all depended modules were already enabled)

Fatal error: Call to undefined function imagecache_presets() in /home/mySite/modules/node_gallery-6.x-/node_gallery.install on line 207

3rd:
# user warning: Table 'drup_ng_gallery_config' already exists query: CREATE TABLE drup_ng_gallery_config ( `name` VARCHAR(32) NOT NULL DEFAULT '', `gallery_type` VARCHAR(32) NOT NULL DEFAULT '', `image_type` VARCHAR(32) NOT NULL DEFAULT '', `data` LONGTEXT DEFAULT NULL, PRIMARY KEY (gallery_type) ) /*!40100 DEFAULT CHARACTER SET UTF8 */ in /home/mySite/includes/database.inc on line 515.
# user warning: Table 'drup_ng_images' already exists query: CREATE TABLE drup_ng_images ( `gid` INT unsigned NOT NULL DEFAULT 0, `nid` INT unsigned NOT NULL DEFAULT 0, `fid` INT unsigned NOT NULL DEFAULT 0, `weight` SMALLINT DEFAULT 0, `is_cover` TINYINT NOT NULL DEFAULT 0, INDEX gallery_image (gid, nid) ) /*!40100 DEFAULT CHARACTER SET UTF8 */ in /home/mySite/includes/database.inc on line 515.

4th (sometimes, when I use the browser back button, I am able again to access mySite. But than, all modules are again disabled. But most of the time, I can't enter the module section anymore, and needed to reinstall drupal):
Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 22800 bytes) in /home/mySite/includes/form.inc on line 1527

5th:
Under the Messaging_XMPP module, I receive the error message: "Xmpp_user (missing)". There is no way at all, to solve this problem! I researched the entire night long on the forum site, I tried to google it, tried all patches available on drupal - no chance!

6th:
Under the UR-Views module, I receive the error message: "Views (missing)". Also here I really tried my very best to solve that issue, and to find the needed file, but there's no chance at all.

Yes, my xmpp framework (without any missing element) is enabled.

I'm totally desperate, because my time is going to run out. I felt like, that drupal has much more enhancements, than my previous joomla! - Should I be wrong, or I'm just too stupid toinstall simple modules?