I want buy stocks. So far I can put aside $50 per month. Should I save some money before I invest. Or buy new shares each month?

Save.

You will hear that you should invest the same dollar amount every month, because that way you buy more shares when they are cheaper and fewer when they are expensive, for an average cost that is less than the average stock price.

That doesn't help if you have to pay a commission on every purchase.

Save up enough to invest in a no-commission mutual fund.

Most online brokerage firms require a minimum of $500 to set up an account. Save that and then get started. After than you can add your $50/month. Good luck

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Don't wait! There is no minimum investment at Betterment, and no minimum balance.

One reason we have no minimum balance is to ensure that every investor can get started building wealth with both long-term and short-term goals."

There is no minimum investment at Betterment, and no minimum balance.