Gnus, maildir, and nnmaildir

[Damian]

Hello,

After two days of futile struggling with gnus, gnus manual, blogs, and
tutorials, I decided to write to you.

The situation is the following. I get my email with getmail, which
delivers it in the ~/Maildir folder, using the maildir format.

Now I would like to use maildir as a mail source, and nnmaildir as
select method. Thus I've configured gnus in the following way:
(setq
 gnus-select-method '(nnmaildir "mymailbox" (directory "~/Mail/"))
 mail-sources '((maildir :path "~/Maildir/" :subdirs ("cur" "new")))
 mail-source-delete-incoming t
 )

But all I see is the groups
      9: nndoc+gnus-help:gnus-help
       *: nndraft:queue
       *: nndraft:drafts

What I'm I missing?

Thanks in advance,
Damian.