Hey there.
Making a simple theme is pretty easy, but you mentioned how to manage different sections, that’s kind of a very broad question, are you talking about making an options page to control them, taking the content some a post, a page or something else?
For the basics of WordPress theme making you can review here:
http://codex.wordpress.org/Theme_Development
The resources area has a huge number of links to valuable resources that will also help you out here.
Take care.
I want to show for example in the services section all the articles that the user will write in the services category. But i don’t know for this i must make any custom post for the services section or just create new category “services” and show this category post in the services section. If so, i don’t know if it’s possible to make some “pre created” category in the code of the template?
Sorry if i am confusing you, i am new in wordpress theme development. thnx 🙂