Go to a non-commissioned brokerage. Like Charles Schwab (not Schwab in particular but that kind of brokerage). Open an account and put the $1000 in it.
Now ask at the counter for brochures on some good-performing mutual funds or ETFs (Electronically Traded Funds). There are THOUSANDS of these, possibly tens of thousands. Restrict your choice to maybe 10 or 20 good-looking ones. Take home the brochures and read them. Look them up on the Internet.
(Learning how to find these things on the Internet is part of the job! The more you want to read about them, the more there is to read!)
Mutual funds and ETFs are managed by 'experts' and you can actually see how well they have done in the past, over the past year, past 5 years, past 10 years, etc. to the life of the fund. This is just like RBI for a baseball player or running yards per game for a football player. You want the olympic athletes working for you.
Now most funds concentrate on some particular aspect of the market. If you had more money (and you will!) you'd break up your investment and spread it around--stock funds and bond funds, foreign and US, maybe real estate, etc. But I don't think it's worth doing that with just $1000. But you could! The idea is that if one sector of the economy crashes, others do better, so you protect yourself by 'diversifying'. Stocks and bonds, for instance, are two ends of a see-saw--when stocks do well, bonds tend to suffer, and vice versa.
I would seriously warn you not to play in individual stocks. They are often crooked, misreported, etc. In 2008 we learned that the stock market is a 'sucker's game', that all the big banking houses are corrupt as hell, and Washington isn't going to do diddly about it, because they are both on the side of big institutional investors. I would also VERY SERIOUSLY warn you NEVER EVER EVER to take advice from a broker! They will always steer you into something that's good for -them-. They are not on your side! They're called a 'broker' because that's what they make -you-! This is why you want a non-commission brokerage.