How to write a song about my aunt?!

I am getting a keyboard in the next 2 or 3 months!. I am buying my first keyboard with my Christmas money!. I would like some tips on writing a song for my aunt!. I am a musician and i want to start writing songs!.
Anyone got any tips!? I am a beginner at keyboards!. Or should I wait to buy my keyboard and learn to play it before I start writing songs!?Www@Enter-QA@Com

---

---