I'm just starting to make quest, so please help me.
1.How to make objects?
2.How to make players use commands?
3.Flagging objects?
4.What is an object?

Please help, otherwise my game would have 8000 pages. SERIOUSLY.

Are you making a text adventure, or a gamebook?

Gamebooks have pages.

Text adventures have objects, rooms, and commands.

I recommend following the tutorial when starting out.
I've been using quest less than a week and have learned a lot already.

I followed the tutorial from start to finish (having absolutely no coding experience I tried to really understand everything I did, not just copying it from the tut) and read online before starting a "real" project.

But yes; read the tutorial! That's a great start.
http://docs.textadventures.co.uk/quest/#Tutorial

thanks cheese.