Mainly for Diatonic (aka "Blues" or "Richter" - with 10 holes)
but most tunes are playable on tremolo also (and surely all are good for chromatic).
Start with harmonica, many of us decide "to find tabs for this cool song I like" and try to play them. This may lead to frustration as not all tunes are good for beginner. Let's try a different approach - we'll make a list of tunes of some traditional, some well-known, some kids songs which could be really quickly learned.
Take few first in direct order, as the corresponding videos have some hints and explanations. Anyway they all are simple and could be learned in a few days (all together). Learning to play them well is a different thing - but you'll have a time to improve after you are basically acquainted with your harmonica.
Don't feel bound to play these tunes "as is" - you can experiment with them as your experience grows - and surely feel free to reuse them to create some music you can call your own!
Bright and well-known tune of hymn / spiritual origins - and just 5 notes in the in the middle region of your harp! Nevertheless vast field for variations and experiments!
Infamous French children's song with a pleasant simple tune (7 notes) - gives practice on rythm and speed!
Also called "Dog Waltz" - amusing in its simplicity (6 notes) and still sounding like classic composition - though actually it is just "arpeggiation" (sequential playing) of two chords, one blown and another drawn.
German lullaby of 200+ years old, easy and relaxing tune which allows you practicing bend on 6-th hole.