Help me write content of adventure website

My friend wants his website on adventure, trek, tourism, etc website to be maintained . . its content . .
He is looking for someone to handle it . . He just wants to fill in contents of its web pages . . So I am offering my help and i want to learn it also . .
what are the requirements for learning . .
i have read once about Cms . . Will it ease the process in such a case or is it complicated to try . . Can anyone guide me into it . . And how good are the cms softwares like drupal , etc . . Any help . .