Day trading requires more money than just a deposit, though. Get setup with a good computer, one or two monitors, a trading platform and data feeds. With many brokers the data feeds for various markets cost money, so pick a market and stick with it. There is no reason to pay for data feeds you won't be using. Also, a consistent income isn't likely during the first six months to a year, so save up for living expenses if attempting to day trade as a primary income stream.
Assess how much capital you're willing to risk on each trade. Many successful day traders risk less than 1% to 2% of their account per trade. If you have a $40,000 trading account and are willing to risk 0.5% of your capital on each trade, your maximum loss per trade is $200 (0.005 x $40,000). Set aside a surplus amount of funds you can trade with and you're prepared to lose. Remember, it may or may not happen.