Getting started....

As you know , the beginning or base of any music is the sargam or saptam sur , i.e namely..

Sa (Shadaj) -- Do
Re (Rishab) -- Re
Ga (Gandhar) -- Me
Ma (Madhyam) -- Fa
Pa (Pancham) -- So
Dha (Dhaivat) -- La
Ni (Nishad) -- Ti



So , after coming across the keys , the next comes the practicing part. The best way to open-up yor voice , the first and foremost and in fact the best way is practicing of -->
S & 'P
First try practicing these individually by pressing the keys individually and matching your voice to the same frequencies . Then , once you skill in them , try pressin both the keys ( S & 'P )
together and then sing the notes S and 'P alternatively .

This is the best excersise for your voice and would give your voice an extended range .
Try that with S & P too .