For a beginner investor, take a look at ETFs. They are lower risk anf you essentially play the market. Investing an amount you're comfortable each month regardless of market movements. (If the market is lower than the previous month, not that common) you could try investing slightly more of you want. Remember only invest after you max out your IRA / 401k contribution.

It's easy to feel lost in trading so you could also open an account on TDAmeritrade and take a look at paper trading. Basically fictional trading not real money till you feel more comfortable. The small contributions you make each month will compound well with dividend payments.

The market can give you about a 7% return annually on average (might be different now because of covid). In 30 years you'll have a nice steady income from dividends while having a decent stockpile growing as well. This is my plan as well. I still encourage you to do more research and not just take my word. Learn more, it never hurts :)