I think don't worry about priority or weight... I suspect that just helps sort incoming packets.
I'm curious what is under "Type" as options.
TTL = "time to live"... one hour is fine.
Points to = I imagine that's the machine IP address on your network that connections to that port should be connected to.
You've provided no context but I assume this is a settings page on your router or something.
Idk, I just found a site that offers free dns called cloudns.net and it offers up to 3 free dns domains.
and for type, i think its just for the type of domain it is. I put SRV because it sounded like server. here are the options:
A
AAAA
MX
CNAME
TXT
NS
SRV
Web Redirect