Website design for a new Start Up company + integrate SAP Business One

Website design for a new Start Up company 5 pages (home, about us, products, importer relations, contact us) We want to integrate sap business one in the same site so that the owner of the company can enter the management of currency accounts and orders, and importers can submit initial purchase orders. I do not know how to use sap business one for the first time. I will learn how to deal with it, but the purpose of this is to organize import requests by importers who wish to import and distribute the company's products. We are commercial agents for a factory outside the country and our services are limited to marketing import offers in return for a fixed commission from each volume of import orders (according to our agreement with the manufacturer, the parent company) We will manually shop for import and distribution offers, and ask serious importers to enter our site to create an importer account on our site (through email and mobile messages together) and then enter into his account, submit a purchase order, and raise the import and distribution agreement contract signed between us and approved on the site through their accounts, including importer information all importers' data, the size of the order, the place of distribution of the product and the addresses of their warehouses, and they can also any reports later on their account, After the importer creates an importer account and submits the initial purchase request through his account on the site, the system sends specific emails to the importer (confirming the order + steps of the import process) with a letter, and the system sends by e-mail a purchase request letter to the factory (the parent company), and sends order via e-mail purchase order letter to the exclusive commercial agent (our company) After sending e-mails to all parties (the factory, the exclusive commercial agent, the importer), they are asked to confirm the request via e-mail so that the confirmation can register the request and follow it up electronically through the importer's system. We would like three powers to approve and follow up on the request: Principal: the commercial agent has the right to see all importers’ information The factory is secondary to follow-up and does not have the right to follow up on the import and distribution contract, but it has the right to see the data of importers Importers: for account management only For those who can do this project, please clarify the following: - The best program that enables us to do the required work with the best performance to follow the work - The cost - The time it takes to set up the project - Ease of the program Thank you