The initial product research will be to find the right niche for you for that purpose certain factors needs to be considered ie the product has average of more than 4.5 ratings in top and reviews less than 1k in top 10, this show us the gap in market where we could step in and launch a product.price$5-60 margin 25-30% minimum

Moving on to sourcing it can be from china or with in state which is cheeper for us keeping in mind the delivery, duties, first order qty will be for 2 months. Barcodes needs to generated as amazon rejects product without these in addition SKNFU for our inventory 

Considering patents is important so we don’t get any cases in future as this could seize our inventory 

Listing will be optimised for a better ranking of products with html tags ebc content for which a good video shoot or photo shoot of product will done and these benefits can only be taken once brand gets registered which is an amazon mandatory requirement too.

For a greater visibility on amazon we will run ppc ads manually and automatically to get best conversion keywords ( marketing ) to be in the top 10 sellers, moreover 20% giveaways and some proxy marketing for social proof

In addition considering 

Competitors analysis

You should keep in mind

Company formation/tax registration etc

Samples Calling (Own & Competitors)

Packaging designing

PPC Video Ad

Photography

Inventory Inspection

EBC+Listing images+Content 

Patent Check

Design Patent Filling

UPC (GS1) (barcodes)

Amazon Monthly

Subscriptions to JS,H10 etc

Inventory costs with duties if any

Im open for further questions