First Plane and a Kit at that?
Welcome!
LT-40 will make you a great trainer and good kit to start building with.
Ar far as the radio, I like JRs also, the one you mention is more than you need to start with and a bit pricey, but, I say buy all the radio you can afford, youll eventually need the features it offers anyway.
I didnt see any mention of getting assistance? You need a trainer pilot or all bets are off.
Find a club and jump in!