DNS and VPS Help

I have a number of domains registered with? various companies and a VPS server hosted by another. I need to point all of the domains at the VPS server correctly and configure MX Records etc. in order to get mail working. The VPS server admin interface is Lxadmin. Basically I would like to speak to someone who understands all of this so they can talk me through what I am doing wrong. I expect this can all be accomplished over a 30 minute phone call (at my expense). Please only bid if? you have experience of VPS services and Lxadmin