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Complete your on page
Submit robots and sitemap
Update fresh content on your website
Write website blogs on regular basis
Claim social media pages
Image sharing is very improtant in e-commerce
Product sharing
Upload small videos related to your products
Claim business listing

Just do the simple on-page optimizations. Follow any good tutorials such as Moz.

hello,
first u have submit your sitemap .
set robot.txt file
Find keywords for your homepage and product pages
Which keywords are your main competitors going for
write all product content unique
then write title and meta description for your site.
Keyword Optimization
Site Structure
Internal Linking
Usability
Mobile Version of Website
Customer Reviews
Rich Snippets
Social Media Integration
all Above the acitivity you have to check while you started seo on e-commerce website.

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There is no role of Google webmaster , analytics.

Anyone give me full details of on page process from beginning to end. Step by step.

It is not good to spoon feed all the details on how to do On Page within your ecommerce site because you need to analyze it by conducting an audit because every sites needs different SEO practice.

There is a 6,000+ word post about this on our blog - How to Achieve Perfect On-Page SEO

Maybe you're talking about the fact that an e-commerce store can only have as much content. You are selling, after all, and you would be far-fetched to write 1000 word product descriptions.
Of course, you should have a blog section on the site where people can get informed regarding the products, their uses, potential problems that might arise, industry news.. basically anything that would provide value for the reader.