Hey Larry,
I'd pick up 2 or 3 batteries. I like hardcase 2S 35+C 5000+ mah something like this if you need Roar (generally needed to actually race) batteries-
Hobbyking Turnigy Battery, or this Cheaper non Roar
Hobbyking battery
I'd also pick up a charger something high end that auto balances, an
icharger 206b or something like it, I have an old
Hyperion charger its been great but its getting pretty outdated.
As for connectors you can put whatever variety you want on as long as you can use a soldering iron. Not sure what the current favorite is...
Hobbyking and
hobbypartz.com have some pretty inexpensive batteries and electronics I've used both without issue.