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Love that you’re thinking so ahead, but you should worry about making the money first. Taxes will be the least of your problems if you want to venture into this

At the end of the year, you will get a 1099 from your broker. If you were net positive for the year, you will owe income tax on whatever your final profits were. If you were net negative, you can deduct up to 3,000 per year of your losses from your tax return. This does not include wash sales if you had any as you can't deduct those.

Whether you made or lost money, and whether or not you withdrew any money from your broker, you must file your trading activity on your taxes. Your broker will not send anything to your employer. If you know how much you will make (relatively) through trading, you can have your employer withhold taxes from your paycheck so to not have such a huge tax bill at the end of the year but I don't recommend this.

You have to think of trading like a business. Any business has to pay taxes on its revenue. This is all a huge oversimplification and there are many nuances with trading taxes. Your best bet is to find a good CPA who knows how to work with traders.