Magento 1 & Magento 2 Customization

I've been taking care of Magento 1 and Magento 2 customization, development, support and Implementation for the last 8+ years.

It could be :
- Convert your existing store into latest Magento
- Migrate Magento 1 to Magento 2
- Migrate all Data from Magento 1 to Magento 2
- Magento premium theme installation & Plugin setup
- Magento custom theme development
- Setting up your product's attributes
- Changing your blocks layout
- Updating/Inserting products
- Bulk import of products and customers
- Payment Gateway & checkout integration
- Multi seller eCommerce store
- Improving your existing site’s functionality, speed, security & performance

And more.

Before buying service, It would be much appreciated if you could provide me detail of updates to know how many hours will it take.

What I need to start the work?

- Detailed information of the issue/customization required.

- Magento URL with admin login details

- Server access (FTP)