Already I have created the world, but not as doing in order that some character are enemy, that the objects could take and that it could have inventory.
That is what I have to do?

Just need to say this, that I believe you really need to look into learning to program first.

There's no point trying to make a game without programming experience. Now you should read a book, Or if you want easier help is to go to youtube.com and see what you can come up with. Personally i think it's easier learning if someone explains it to you. Books can leave you with a lot of questions.