Confused about MX record in DNS

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http://forums.opensuse.org – I have read several guides about setting up a DNS server using Yast, now I am confuse, some guides use hostname in mx records and ns records, other guides uses alias, with the respective A record not been the hostname but and alias, Now, I have a DNS server with the hostname server01 with the ip address and a router with the address, this server is also the mail server, how will be registered the NS record, and MX record and the A record in yast for this server? I was thinking in ns record as server01 MX record server01 with the value of 0 and an A record server01 A 192.168.10 this is only for learning, I am just trying to understand this. thanks. (Distributions)