Firstly I think that will be good to learn C-major scale on harmonica without bends. Firstly in middle octave because there are all notes. Then play first and third octave keeping in mind that there are missing notes (F,A in first octave, and A in third octave).
here are c-major scale
It is not important which harmonica You will use. When You be able to play C-major scale from sheetnotes then try to play melodies. Maybe firstly simpler melodies. For example “ode to joy”
Then try to play more advanced tunes like “As Time goes by”.
Playing from notes isn’t impossible and opens door for playing melodies without tabulatures.
Couple weeks ago @HarpinBobbyMcB made notes chart.
Maybe will be usefull for you. Here is: Scales - #14 by HarpinBobbyMcB
But. Personnaly I think that most efficient way to learn new melodies is to listen it many times and then play by ear. Playing by ear can be supported by application (for phone or computer) to play small parts of melody looped and slowed down.