Go with a "G" rather than a "C" - it's lower and easier to get a nice sound, especially playing chords. I was 8 when my Aunt bought me my 1st harmonica (for Christmas 1955) ...... I'm eternally grateful to her for getting me started on a most wonderful musical journey. It was gift-wrapped with a Larry Adler "How to play" book that taught you how to play it PROPERLY ie..... using the tongue-blocking method whereby you use your tongue to cover 3 holes to leave the 4th hole exposed between the right-hand edge of your tongue and mouth.

Blues playing/note-bending and other special techniques will follow later..... it's a BIG mistake to try to start playing "cross-harp" blues right from the off. Simple steps and building blocks are the way to go.... Little Walter, Sonny Boy Williamson and Sonny Terry etc will scare the poor little mite. Twinkle Twinkle Little Star is more sound advice.

The "U" shape tongue to isolate individual notes is a nonsense - don't go there.