Who is the Mandalorian?
Well, we don't know -- obviously. But the Mandalorian Culture got a major retcon when Disney bought Lucasfilm and reset the expanded universe of novels, comics, and video games. They're completely separate from Jango and Boba Fett, who were revealed to be the genetic basis for the Clone Army of the Republic in Attack of the Clones. Last seen in Star Wars: Rebels, the Mandalorians were just uniting under the banner of a new leader who was part of House Kryze. The political structure is a pyramid shape with a single leader, the Mand'alor, at the top, "Houses" in the middle level and the base being "Clans," which were more likely to be made up by bloodline connections.
The reason the structure might be important to note revolves around the scene in Chapter 1 where Mando goes to visit another Mandalorian armorer who melts down his Beskar steel into a shiny new pauldron. She asks if he's revealed his signet yet, and he says he hasn't and she tells him he will soon. A "signet" is usually a symbol on a ring, and in previous non-canon Star Wars stories they were used to show one's allegiance to the Rebels, Empire, or Jedi. However, since this signet info is dropped in conversation between two Mandalorians, it suggests this signet won't be about a political alliance, but an identity reveal. A significant Clan or a House maybe? What symbol would be so recognizable in this world that Mandalorians have to keep it hidden?
Even if our Mando is a Foundling and has very little connection to his family line, he does seem to represent the Mandalorian cause just as much as he shows us the bounty hunter lifestyle. The Ugnaught Kuiil, voiced by Nick Nolte, helps The Mandalorian find his bounty in the episode just because he'd heard stories of Mandalorians but never met one. There's lots of talk of Beskar, special Mandalorian Steel that was taken by the Empire at some point (during the Great Purge) and made into marked ingots. Beskar is an extremely strong alloy that could even deflect a lightsaber blow. Mando is collecting Beskar to make authentic Mandalorian armor, slowly piecing together a full shiny set of new duds.
All of these plot points are cool to think about and may be dealt with, but mostly serve to orient us in-universe to the mood set by the first scene of the show. When Mando takes out some bar bullies while apprehending the Mythrol played by Horatio Sanz, we're introduced to a cowboy walking into a saloon, the "man with no name" archetype. He's a badass, he's mysterious, and in the case of The Mandalorian, we can't see his face or hear his un-distorted voice. We're dealing with a rogue who is amassing symbols to build a personal mythology. He has the helmet to represent Mandalore, a signet to honor something (probably Mandalore), and he's building scintillating Beskar armor. He's not becoming himself -- he's becoming legend, piece by piece, bounty by bounty. That's also how we should expect to get our information about him: a steady drip.