For pens I would suggest looking for a set with multiple sizes- i honestly wouldn't spend a fortune for his first set- just need to make sure the smallest is 005 so he can get real detailed. I found this on Amazon that seem similarto mine:
https://www.amazon.com/Tinge-Fineliner-Assorted-Coloring-Detailing/dp/B086P34MW6/ref=mp_s_a_1_33_sspa?dchild=1&keywords=black+pen+set&qid=1604330883&sr=8-33-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUE4NEZYTUZYSkVYWVcmZW5jcnlwdGVkSWQ9QTA1NzE5NTEySjZTRE1DQkxKV1laJmVuY3J5cHRlZEFkSWQ9QTA0NzI1NzRGQlIzNzlUU1RCSjYmd2lkZ2V0TmFtZT1zcF9waG9uZV9zZWFyY2hfYnRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==