Arcane disciple isn't worth it to cast enlarge person once a day, you're better off getting improved initative, EWP spiked chain, combat expertise to set you up for improved trip, or even improved bullrush to set you up for shock trooper.
You have to wait until level 9 to get arcane strike due to needing 3rd levels spell to qualify for it.
Arcane channeling is a part of a standard attack so at level 6 you eith do one arcane channeled attack or 2 non-arcane channeled attacks. You have to wait until level 13 to be able to arcane channel into full round attacks.