Intrebare incepator

Buna ziua. Sunt incepator in Drupal si am si eu o rugaminte, cine ma poate ajuta cu o problema legata de crearea paginilor. Concret: am instalat drupal-ul, am creat meniuri, dar m-am blocat la crearea paginilor. Ex: in meniul "aaa" trebuie sa imi apara linkuri catre alte pagini din site. M-am dus la creare pagina, dar ceva nu iese la aceste pagini pentru ca imi apar doua tipuri de mesaje . Primul e ceva de genul

* user warning: Duplicate entry '0' for key 2 query: INSERT INTO node (vid, type, language, title, uid, status, created, changed, comment, promote, moderate, sticky, tnid, translate) VALUES (0, 'page', '', 'ovidiu', 3, 1, 1223965408, 1223965408, 0, 0, 0, 0, 0, 0) in /home/classhos/public_html/cjneamt/includes/common.inc on line 3303.
* user warning: Duplicate entry '0' for key 1 query: INSERT INTO node_comment_statistics (nid, last_comment_timestamp, last_comment_name, last_comment_uid, comment_count) VALUES (0, 1223965408, NULL, 3, 0) in /home/classhos/public_html/cjneamt/modules/comment/comment.module on line 607.
* The post could not be saved.

Sau imi apare mesajul cu "The path is already in use."
Evident , cand ma duc in pagina initiala "aaa" si incerc sa fac link catre pagina respectiva imi spune ca "

Page not found
The requested page could not be found. "
Imi poate explica si mie cineva unde gresesc?
Multumesc