3 popular delivery models are there with Amazon India. So sellers could sell their products at ease.

1. Amazon Flex: Its a program, where in you can allocate specific area in your own warehouse and that place will be now called as Amazon warehouse. Benefits are all your products would be listed in FBA or PRIME without actually sending your Inventory to Amazon warehouse. So its easy to participate in all deals and what not to boost your sales.It does take multitude of things to start, like Personnel, 3 Computers, 2 Printers (Almost cost around 60k), packaging material etc.Its time consuming as many factors play in, but once its setup then its good for you. Some additional costs are also there. Here no shipping charge is required since area wise warehousing is done and things are being delivered from those warehouses.
2. FBA Program: Fulfillment by Amazon (FBA) helps you increase your online sales by giving you access to Amazon’s world-class fulfillment resources, fast, free delivery options for your products, and trusted and acclaimed customer service. Simply send your products to an Amazon fulfillment center, and we’ll store your inventory, pick, pack and ship your orders across India and provide customer service. Link is: https://services.amazon.in/services/fulfilment-by-amazon/benefits.html No shipping charge is required since the products are being delivered from the amazons warehouse.
3. Seller Fulfillment Program: Delivering products as per the orders from your own store/factory/warehouse. Here the shipping charge is applicable.

Importance of warehouse in quick delivery: If you are sending the products from East and from your own warehouse, people ordering from Western part of India will see 4-5 days of delivery time. Since online is meant for fast movement, you may lose the sale and another company may win the race since that warehouse is based on West or they are with FBA program or they have tied up with ecommerce aggregators or local distributors where from they can dispatch the order. In that case the delivery time will be 1-2 days.

Thumb Rules: Price greater than 300/- is high sales price. Go for Flex or FBA model. Less than 300/- is low sales price. Go for sellers fullfillment model.

Algorithm: If you have a wide range of products and/or combo products or variations, it is better to have few star products with tags like amazon choice or best seller. More product range (if you are not brand or not spending money or not doing some exclusive deals) means low visibility organically since the space allocated to new seller is limited. So it is advisable to launch with few products, make complete use of the space given, then keep moving slowly slowly.