update functionailty magento site

Migration from BigCommerce to Magento ver. 2.1.2 (Graphics from the existing site can be sent over as files sized to match the new template) At this point in time the install can be uninstalled and a different version of Magneto could be installed if necessary. (Default CPannel Install) Magento will be hosting multiple stores in the future (domain 1 & domain 2...etc.) from the ground up this needs to be set up correctly. (Strong and defined logic for what is global) RMA logic setup The business sells original products once that product sells we want a automatic redirect in place that would lead the user to the category the product was in. For example: [login to view URL] Would redirect to: [login to view URL] (Automatically once item A sells and the quantity is 0 The above script would do the reverse if /ItemA has stock or quantity is not 0 NICE TO HAVE: Store exposed in Facebook, twitter & pintrest or posting ability. Google Shopping feed set up and tested All products can be sent over from existing site with a inventory management utility we use called ecomdash if appropriate. (The site you will be copying is live and new items are added daily and sell out daily) all product url's need to remain the same, we will simply re point the Name Servers to the new site. one page checkout if possible for clients Admin needs the ability to process a phone order and authorize a credit card over the phone NICE TO HAVE: Admin needs the ability to create a order for a customer, an e-mail is sent to the customer to complete the checkout 10 percent coupon offer when a new visitor browses site for the first time. Coupon use 1 time only per visitor. NICE TO HAVE POS Interface (Support for looking up items by our SKU's and UPC Codes) most products are bundled and include various accessories. If a customer is interested in a product the price is defaulted as a bundled purchase however they need the ability to swap out bundled accessories, (Other products in store bundled with product) which will change the price of the package. (Need a strong logic and ideal way to handle this) ability to choose colors of finishes ability to delay ship (Note pops up with notice they OK) The choices the customer makes will update the price e-mail order confirmation can tell if LTL freight is involved and send out notice phone number is required with all orders shipping methods set up: UPS, FedEX, USPS, local pickup and LTL Freight based on an items weight. (LTL Freight kicks in to a table rate after the order exceeds 75LBS) set up all order process e-mails customized with our logo and messages All static page content needs to be migrated Payment methods integrated (Paypal Payments Pro & Amazon Payments) crown jobs and other settings configured as appropriate. read requirements then bid on project