I am engaged with selling in Amazon in an American company. We upload bulk items (Clothings).Though it is very hard, there are so many shortcuts and I am sure 5 days are enough to learn. But if needed you can ask me through e-mail. Main lessons-Inventory bulk loading, finding relevant keywords free, FBA (the whole process), price and fee calculation, etc. I keep the price very low due to gain positive feedback in freelancer.com. Wish you accept.