Newb question- kid wants to sell ‘lemonade’ and accept bitcoin.

Background, relatively new to bitcoin. I personally have a Shakepay account that I use to buy some bitcoin, my kid wants to sell stuff and accept bitcoin as an alternative form of payment.

What steps should I take to set my kid up, and is Shakepay a viable option or is there a better, more common method to accept payments? I understand that most ppl probably don’t use Shakepay.

Thanks in advance