internet providers (ISP)

[ohara]

Hello everyone.
Ladies and gentlemen, I have a question.
Where I live, everyone uses wireless internet. I have pre-talked to the university and am trying to become an ISP to distribute wired internet.

Please let me know what hardware I should buy.
Server, router, software: Ubuntu or Debian with DHCP server.
And one more thing, I don't want to assign IP behind NAT, only from the assigned pool of external IP addresses. For picky recipients, I plan to assign a fixed IP.
Please give me a hint.