Hi!
I’m new at Asterisk and I really want to learn about it and what it can do.
Already install AsteriskNow and tried do enter in FreePbx User Portal with root but no can do 
Can anyone help me in my firsts steps?
Thanks.
Start here asterisk.org/AsteriskNOW-1.5-QuickStart and then download the manual of FREEPBX
ok, that was a breakthrough 
I already add 2 extensions. How can I connect 2 physical phones in my server? Can I link one switch VOIP? Or that was a very dumb question?
You need IP phones matching to your server or Analog phones connected to an ATA, or even a analog inside your server with FXS ports an connect directly.
You need to create peers to use them.