GTM Changes on LDNS

To implement GTM i need to provide my manager with what i need from DNS admin in terms of DNS language ( DNS records ) , i'm not a DNS expert & i need to provide it in terms of records :

 

 

1- i want his LDNS to forward any DNS request requesting "www.mycopmany1.com" ( Web Server ) to my GTM IP , how can i tell him that in terms of needed DNS records ? can i have an example of the record ?

 

 

 

2- i want his LDNS to forward any DNS request requesting "server2.email.mycopmany1.com" ( Mail Server ) to my GTM IP , how can i tell him that in terms of needed DNS records ? can i have an example of the record ?