the foods you got are good choices, but the amounts are really going to be up to you and a little experimentation. try your workouts on your current carb amounts and see how your body does. if you're tired or hungry later in the day or the next day, it might be time to up the calorie intake a bit. if that doesn't help, then add in a little bit of those carbs, and see how it goes. really experiment...try carbs pre-workout, post-workout, the day before, the day after, low carb, very low carb, etc. and keep a journal or find some way to track how your body is responding. that might help give you a sense of what you need for fuel and how much.
personally, i don't really think you're going to need to add many carbs during your training, though you may want to eat more calories. is it a sprint triathlon? olympic? HIM? IM? you might find that you can stay fairly low carb (if you want) training for the shorter distances, and maybe carb up before the race. or, you may just find that you need some potato or rice or starchy veggie on your brick days...but the high carb thing really comes from conventional wisdom and isn't necessarily true for everyone.