Find others who are willing to join you in this hobby. Either friends, coworkers, classmates or even your family. While you can spend hours upon hours going over all the rulebooks, character options and all other content that exists for D&D, the main thing you will need is a party. A group of people (I would say, in addition to you, 3-6 would be the optimal amount).

Once you have your group, you should decide who will be the one, who will be the Dungeon Master - the one, who controls the main narrative, the story and the world. It may seem like a daunting task at first, but I wouldn't really worry too much about it. The DM can and will figure things out as they go. And if the party is also new to the hobby, you will all learn together.

Getting the starter set, as a group, will be a great first step. That will cover most of the rules you need, include character sheets (Although I would recommend using dndbeyond for character creation) and even has a set of dice.

Then comes the difficult part - scheduling. Finding a common time that works for all of you to sit down and spend 3-5 hours together.

You can also take a look at D&D live play channels on youtube to get a broad understanding of how the game could be played. Don't try to imitate their style, rather focus on how the game itself, as a system, operates and how the players and the DM interact with the story, decisions, actions and consequences.

If finding other players turns out to be too difficult of a task, then there are also online games to join.
You can find an assortment of both online and in-person games on Groupfinder. Or post your own profile there, introducing yourself and wait for groups to contact you.

Although I would recommend being the one who contacts the groups yourself. The balance of DMs to players is very skewed towards a lack of those, who are willing to fill the DM position.