Self Web Hosting Small Business Site On Home Network

Hey r/selfhost o/
I am currently trying to create/host a small webpage for the business I made. (ironically for residential tech assistance, lots of elderly in the area that need help with the little things) I've not played with networking side of things however, with the exception of rewiring CAT-5 for Ethernet, and a bit of port forwarding.

I would like to just set up on a spare laptop for now, so I have a legit website. I can expand and build a dedicated rig later. Port 80 and 443 are blocked on the ATT Uverse router. I am also curious/interested in replacing the ATT router with a 3rd party/non rented ISP router. Is that something I should expect a line item for on the bill?

What recommendations, and steps (and in what order) do you recommend? I would like to expand my knowledge base though this adventure, without compromising the security of the home network (with open ports from outside to inside LAN) While I could just do a simple cloudflare web host, that doesn't seem like... as much of a learning experience? Am I just being contrarian avoiding that path? thoughts? Should I consider it more seriously?