I say get down to yer local music shop (if they even still exist?), and have a look at the different types. There's basic ones, small ones, and fancy ones with pitch slide buttons.
I tried many years ago with a blues harp, and by christ, do you need lungs like an athlete! I was fooked beyond belief. It's more than simply blowing and sooking (
...that's what she said!) But, it got to a point where I could rattle some VERY basic things off whilst playing along to a couple (emphasis on the
couple) of tracks, and even then, I'd lose it halfway through.
Breaking in a harmonica is probably the hardest part, cos all the reeds are solid. Blowing in and out is fine, but when trying to ''bend'' the note up or down, really takes some doing on a new 'monica. You'll think you're never going to get it to bend (oo-er missus!). But, this is when Percy Verance comes in. He's a great help.
And it wasn't hearing the like of Dylan or early Rolling Stones blues that got me started. It was an LP my Father had of Larry Adler. (Cue everyone asking ''who the hell is he?'')
The only bad thing about the harmonica is along the same lines as an accordion - there's no headphone socket to practice with to not upset the neighbours. We've almost all heard a kid at xmas who gets a mouth organ in his stocking (stop tittering! In fact...titter ye not) and within 2 hours the parents lose the plot and the 'monica is never seen again.
OK, adults are a bit more tolerant, and same can appreciate where yer going with it. My best place to practice was either in the woods when out with the dogs, or in the car (as a passenger!). Anyhoo - best of luck with trying it out. YouTube has HEAPS of starter vids and sometimes explains better than buying a book from a shop and trying to figure it out from there.
Ask around to see if there are any local bands playing that use a harp, and if you go up to them and explain what you are wanting to try, they can be very accomodating in giving tips and a quick lesson! - Or, place an advert on Gumtree, asking for starter lessons - there may be many an old guy willing to come out of retirement to teach you, or get you started.
(edited: I noted heaps of obvious spelling mistakes - Typing in the half-dark with the glow of the monitor....must put a light on!)