My First Steps And Problems With Logic. Options

[machwok]

Hi,
I hope my topic will be understantable (english isn't my first language and the last time I used music program (Cakewalk) was about 8 year ago)
A few day ago I bought my first in my life Mac and yestarday I started an adventure with Logic. As always begings are hard. I want to create my first project by using piano roll, but I do something wrong, bacause it doesn't work. When I create new project I choose "External MIDI". I do this because it's only place where I can see instruments which I want to use (piano, bass, drums etc.). But when I choose any of instruments and I use a piano roll (now I don't have any external MIDI keyboard and it's why I use an internal piano in Logic) I can't hear anything. When I, for example, choose loops it's ok, but when I add this to my project and press "play" I can't hear anything again.
Could you tell me what first step I must do? Which kind of project choose to do what I want, that is put note after note in piano roll and of course hear it?
By the way, do you know how to use sf2 files in Logic?
Thanks for any help.

[Dasa Soul]

Aloha from Hawaii !! hey thats cool, very nice toy , lol . you can go to You Tube and look for Logic studio tutorial, there is lots in there, have fun fun fun in the autoban !!!

[machwok]

tweedmusic, dasasuol,
it works! I made stupid mistake, because I chose "External MIDI". It's strange because I used other project too and I really don't know why didn't one of them worked later. Nevermid. At last I made my first "song" on Mac! Now I can enjoy it and... gather other questions.
Thanks!

PS. "have fun fun fun in the autoban !!!". You mean Kraftwerk or this great arrangement of Senor Coconut?