First Investment: How to Really Start, Step by Step

It's Friday evening, you're lying on the couch scrolling through your phone. A friend sent you a screenshot showing how a stock he owns has grown significantly over the year. You open an investment app, register, deposit 5,000 Kč — and then you stare at a screen filled with thousands of tickers and charts that look like EKGs. Your finger hovers over the "Buy" button. And you know absolutely nothing. We've all been there.

Good news: you can start in a way that's not just random tapping. There is a sequence of steps that makes sense even on paper. Let's go through it — with concrete numbers, not just phrases.

First, the Math That Will Protect You

Before you send your first crown to the stock market, you need to know one thing: only invest money you won't need for a year or two. Why this particular timeframe?

The stock market grows over the long term, but it can be quite volatile in the short term. Historically, the main American index (S&P 500) has fluctuated from declines of around −37% (in 2008) to increases of over +30% in individual years. If you need to withdraw money for rent in such a year, you're selling exactly when you're at a loss. It's like selling a bike in winter when no one wants it.

Therefore, step zero: reserve. Keep about 3–6 months' worth of expenses in a savings account. Only what remains goes to the stock market.

A Small Example with Numbers

Let's say you have a net income of 25,000 Kč and monthly expenses of 18,000 Kč. The reserve should be roughly 54,000–108,000 Kč. Until you have it, investing can wait. Once it's filled, it makes sense to send perhaps 1,000–2,000 Kč monthly regularly. Not all your savings at once — regularly.

Why Regularly and Why Small

Here comes the magic called dollar-cost averaging. When you send the same amount each month, you automatically buy more shares when they're cheap and fewer when they're expensive. You don't have to guess "when is the right time" — because almost no one can guess that.

The data is quite unforgiving: most people (even professionals) who try to time the market — to hit the bottom and the peak — long-term underperform compared to those who simply bought regularly and boringly. Boredom is your friend here.

And why small? Because the first year is mainly training for your own psychology. You want to find out how you feel when your portfolio value drops by 8% in a week. It's better to find this out with 3,000 Kč than with 300,000 Kč.

One Broad Basket vs. Hunting Individual Stocks

A complete beginner usually has two paths: