HOW DO YOU BECOME A BODYBUILDER

YOU'RE USING CAPSLOCK GOOD THAT'S THE FIRST STEP

You go in and you choose the parts.
Oh wait, that's Build-A-Bear. Sorry. I guess you just work out until you nearly puke.

Make sure you get proffesional instruction.. You want someone to make sure you are adopting the right physical stance when exercising and the correct breathing method.. Too many people go to the gym and just attack the weights and end up destroying their shoulder joints and doing their backs in.. When a couple of sessions with an instructor would have saved them from all that pain..

Lift big iron hunk many time

Start with milestone goals. Next, focus on form. Then and only then, engage in progressive overload.

Look for either a trainer or a good workout training app that builds a schedule based on your weight, age, gender and goals.

Lift some wieghts. I hear they do that. Maybe start there. Others there might lift wieghts too

Get a job in a farm store loading bags of feed into trucks. That ought to build muscles quickly

Find a gym where body builders work out, tell them your goals and sign up.

Talk to a trainer in a gym. Stay natural.

Lego have some good kits.

Ok

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There is so much info online this is not a good place to ask. Join online body builder communities and start following their tips. Change your diet and workouts to suit your objectives.
Most are using enhancements also so you will have to decide if you want to be natural or not.

Eat eat and eat everything and work out