Help with Minecraft Multiplayer ??

[Emjeadea]

Can someone please tell me the easiest way to set up a multiplayer game on minecraft as im kinda new to it and me and my mrs wanna give it ago together?
Also how do we mod as i tried copying the maps into the mod section and have nothing, sorry in advanced for being such a noob

 

[Emjeadea]

cheers ill try hamachi as i already have that for football manager, can you mod the single player with bukkit

 

[Emjeadea]

What do i do under the add server settings ive tried putting my hamachi address but says cannot find server

 

[Emjeadea]

cheers peeps ill let you know if i have any luck, whats the port forward for will it not work over the net if not, i know how to forward ports (unfortunately i have to do this for COD)