Agent Portal Access for Processing Orders

I need to create a website with portal access for sales agents to login. Agents will have the ability to access marketing materials (will be uploaded by me), be able to create proposals for leads, create sales orders, process orders and sign up customers. Portal should keep track of each individual agent's orders, and agent needs to be able to view all processed orders with total amount of the sales order, each agent will be paid commissions from 10% to 20%, and should be able to calculate the processed sales orders with such percentage. Agent percentage will be assigned by me. Customer sign up will have multi-page form, first page will be quoting: how many users will create quote for lead, second page will need to connect to an API to access available phone numbers to purchase from VoIP gateway, available numbers can be reserved through gateway, need to be added to shopping cart, third page will access phone devices inventory and will be able to add to cart which ever phone devices they want to purchase, fourth page will ask for Company account information (ie: company name, address, phone number, email, person's name) and need to accept Terms & Conditions before moving to next page, 5th page will have check out, credit card information request, and detailed information on order (ie: users, phone numbers, devices), we charge a monthly service fee per user, so check out will have two totals, one on how much their monthly service fees will be based on the total users requested, and how much they will pay at check out based on devices chosen. 6th Page will be a receipt once check out page has been submitted. phone order api url: [login to view URL]