Shopify Guru Requried Please

Hi

We currently have a B2B Shopify website that requires modifications detailed below:

1 - Setup Wholesaler Registration, Verification, Login and Pricing (custom, tiered, bulk), MOQ, Tax etc.
2 - Improved product categorisation / organisation
3 - Improved Search / filter functionality
4 - SEO improve
5 - SKU / Part Numbers visible to Google
6 - Improved payment process / Accept payments
7 - Xero Integration (TBD)
8 - Set up the Shop channel (can this be used to create our own App?)
9 - Improve user experience
10 - Improve design

The Shopify site is connected to our invetory system Unleashed Software - https://www.unleashedsoftware.com/app-marketplace/shopify-inventory-management/

Please only apply if you have experience (done most of this before) and can offer real guidance - Gurus only sorry!