I'd like to tack onto a post by SuperT.... make sure you either have a DMM or a cartometer (one of those little black boxes with a 510 connector on it, screw on your atty after you build to verify your resistances). You could also use your MPV 2 to check, as long as you don't plan on building coils below the MPV 2's lower threshold to check resistances.
Another thing no one mentioned that is very important... a battery charger!
I'd recommend the following (as I've heard they are all decent to good chargers) - Pila, Nitecore I2/I4/D2/D4, Efest LUC (2 and 4 bay), Xtar VP1/VP2. Doesn't matter if you have good quality batteries (never buy a battery with "fire" in the name, or so I was told) if your charger is garbage.