In most cases, your broker will charge a commission every time that you trade stock, either through buying or selling. Trading fees range from the low end of $2 per trade but can be as high as $10 for some discount brokers. Some brokers charge no trade commissions at all, but they make up for it in other ways. There are no charitable organizations running brokerage services.
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Think win/win. Psychology is a huge aspect of trading. If you have a big winner on your hands and aren’t sure whether you should hold the shares to try for higher prices or sell them to lock in a profit, consider selling half and holding the rest with a stop loss (at worst) back at your original buy price. That way, if the stock drops back to your buy price, you still win because you sold half and made a profit. Similarly, if the stock shoot higher in price, you also win because you still hold half your original position. Heads you win, tails you win too. 🙂
You'll have to do your homework to find the minimum deposit requirements and then compare the commissions to other brokers. Chances are you won't be able to cost-effectively buy individual stocks and still be diversified with a small amount of money. Given these restrictions, it's probably worth starting out on your investment journey with mutual funds. However, like all aspects of investing, it's up to you to do the research and figure out the strategy that suits you best.