What are the steps to Build Ecommerce Website?

What are the steps to Build Ecommerce Website?

Well this would depend if you are building it from the ground up ie no website frameworks or 3rd party tools. Which would be a very time consuming thing unless you are a super genius at coding. Also what language and platform would you use it on.. do you have branding and design elements ready ?
Given the information you have supplied i can only say this..

Generally speaking : to me design is a circular process of continual improvement.
Research your target market and competitors.
Plan your Ux
Write your code front end and back-end. ( hopefully you have a team to do this for you )
Test test test Debug Then test more. ( Youl be spending most of your time on this. )
Deploy.
Market market market ( social media channels, google seo, adwords and all the rest that may apply to your niche )
Get out of sandbox ( if your domain is new )
About three months of gathering analytics data you can start tweaking pages that arent performing.
Re evaluate ( this could be a plethora of thing from UX that isnt working for your client market, to coding that is slow, bad or insecure. )
Test test test Debug Then test more.
Repeat Cycle.

Get on a platform like wordpress.
Research your market.
Get a eCommerce theme
Customise the heck out of the php file templates so that it can operate better.
Plan your ux and marketing.
Test payment gateways and emailing systems.
Get a ssl certificate if you arent using a offsite payment gateway.
Analyse your data
adjust what needs to be adjusted.

Go to shopify, set up a site, hope you get noticed.

Oh also google integrations, sitemaps, analytics you will likely need to use a smtp for gmail as most hosts have issues with the mail() function although I have been fortunate with most of mine.

See how hard a eCommerce store really is. Consider if it was worth writing this from scratch... or the time would have been better spent on ... you guessed it marketing...

Building an Ecommerce Website in Simple Steps:

Choose a domain for your eCommerce website
Choose the Right Platform
Design Your Store
Set Up Payments
Add Products
Test the Checkout
Look After SEO and Analytics

Select And Book a Domain Name. ...
Scout For Server Space For Your Domain. ...
Step 3.Choose a Website Developer. ...
Simulation of Your E-Commerce Site. ...
Get Into the Shoes of Your Potential Customer. ...
Website Aesthetics – Attach a Logo and a Banner. ...
Backup Your Entire Website Building Project. ...
Edit Your Website.
Market Your Website with SEO
Initiate Marketing Automation Strategies