Little help about a motivation letter, please

( I apologize for my English)

Hi to everyone. I am new here i was searching for some help in google and I found this great site with those helping forums.

Here is problem...

I have to write a motivation letter for a private academy.(a private academy for software developers)

I am 19 yeas old and I don't realy have much experience, I just need a litle push with the start.

I've written some motivation letters before but for a job position wich is much easier for me.

Thank you.