Build me a customized integrable IT Asset Management System

We are wanting to replace the spreadsheets that we use to track all our our assets. Please see attached document for more details. We would like an asset management system that is customized fit our needs. The system should include: Integration with our current systems in place (Shopify - ordering/returns, Shipstation -shipping assets , and Stripe – credit card billing) Ability to associate sim cards to a carrier Ability to track wholesaler info, sales order number, sim card numbers, router IMEI numbers, and MDM numbers Ability to create interlinks with the numbers above to customers or default location Ability for customers to be linked/associated with multiple assets Ability to add fields as need arises Ability to accept returned assets and cross reference to original sales order number Ability to query system by asset numbers or customer info Ability to graphically show trends, depict current inventory levels on hand, and any other useful visual representation Compatible with various mobile devices Testing and quality assurance Customer service support as needed In addition to the above system requirements, we would like training to help us become familiar with the using the system. The training is not required to be conducted onsite. We would like to employ a firm or contractor who has familiarity the growing needs of a small business.