I just installed Sublime 2 with Zen Coding. I cant seem to find whats how I can expand abbreviation, I tried many combinations, like Ctrl+E, Ctrl+Alt+E, Ctrl+Alt+Enter … How do I get it to work? How can I discover the keyboard shortcuts?

look at the Default (OS).sublime-keymap file which is in the Zen folder. Remember as well that they’re context-specific. You have to be in a HTML document to activate many of the key commands.

Just write the code (in the Zen Conding Semantic) and then press tab at the and of the line.
If you installed Zen Coding correctly it will work.

Ctrl + Alt + Enter it’s the shorcut for “live” Zen Coding.