Alright, for this, you'll only need a few basic things.
--Solder Iron, Solder Wire (Buy it here for $8.00)
--NDS Charger, USB Cable (Lite or Launch, Type-A Male)
--NDS (Lite or Launch) of course ;D
Also, recommended, you only use the chargers provided by Nintendo. These will last MUCH longer than 3rd party chargers.