Running Ubuntu 12.04 in virtualbox and am not sure about the dns requirements for Zimbra

Do I need to install bind and setup zones or can i do this in the Domain Control Panel (enom.com) from where I purchased my domain (mydomain.com) -- it allows DNS setup of A and MX records, etc??
I am not very familiar with DNS setup and have never setup a dns server.

I have DNS A records for *,@,www already setup for mydomain.com and pointing to my IP address of 184.71.71.x

If I can use enom.com dns setup, then I need to setup an MX record for mail.mydomain.com (i think).

Not sure where to start

Thanks