Amazon Store Front- Fulfillment by Amazon

Does anyone here sell products on Amazon using their fulfillment service, where you send inventory to Amazon and they take the online orders and ship them? If so, how have you set it all up within the E9 environment?
How do you manage the separate inventory that is stored offsite? How do you handle recording orders?
How do you account for all of the fees associated with the transactions? (FBA fees, referral fees, storage fees, store fee). Any insight would be greatly appreciated.