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!!! Machwoc, i am happy that you got your first "song", Logic is realy a fun easy to use program to have , i love to use Logic/Reason 4.0 rewire, for more fun fun fun in the Coconut land , yes Kraftwerk

[machwok]

Yes, even at the begining Logic looks better then every music programm I've every used. I hope I'll be enough patient to study it. By the way, do you know how to resolve problem of a sf2 files that consist of some sounds? I've heard Logic have a problem with them and play only first sound of a set.
PS. If you don't know Kraftwerk's "Autobahn" arranged by Senor Coconut you must listen to it. It will be better background to a view of falling coconuts than cold Kraftwerk's sound.