On DNS you need A record if you have ipv4 only or A and AAAA records if you have ipv4 and ipv6.

You DNS outside you home servers? If you have dynamic IP at home you can’t host DNS on home server.

You have only 1 IP? You need port forwarding on you home gateway to home servers if you use somerhing like SSH. If you want access to something web based you need proxy. NGINX for example.

How it exactly work:

• Somewhere someone write youdomain.com in browser.
• Browser ask local dns: who is youdomain.com
• local dns ask another dns, and another and in one iteration request go to you dns. Or maybe some of dns have cached answer. But imagine that not.
• You dns send answer youdomain.com is 111.222.333.444 for example. That is A record.
• DNS work over on that.
• Browser send request to 111.222.333.444 with HTTP header “Host: youdomain.com” and some path. / or /something maybe.
• Some balancer should get request and send in to right server in you home network.