Welcome to the forum Rockville, gonna be a nice pond. As far a feeders go most will operate fairly well on just battery power but you can get solar chargers for most of them, and since your feeding go with the aquamax Largemouth pellet, it's big and 45% protein.
Also if you want big bass don't overdo the amount of structure so they will be able to get at your forage.
Hang on and you should get info from the bass experts, good luck.