In response to your questions, I don't routinely recommend using bottles in the first few weeks of life, so that everything is "just right" for breastfeeding. I feel "nipple confusion" is really more of a problem in the first few days or week of life as the baby is learning to suck and swallow. A different suck is needed for the baby to empty a bottle as opposed to a breast. Once he's mastered the technique with your guidance, it is much less of an issue, if at all. I also want to maximize the amount of milk you produce. The more often you put the baby to the breast, the more breast milk you'll make ("demand and supply"). This is related to the hormones in your body.
Most importantly, relax! Keep asking questions until you have all the answers you need to feel absolutely comfortable with your decisions. Your baby's doctor is there to help. It's OK if you're unable to continue breastfeeding for an entire year. Your baby should be fine--he'll grow and develop normally. Do what works best for you.