Upgrading from R11i to r12.1.3.....In R11i we have Collections > Customer Accounts to identify aging

 We are upgrading from R11i to R12 
As we all know, in R11i Receivables If we have to see or Overview invoices and aging of a Customer Account we go to Collections > Customer Accounts.

In R12.1.3 the collection functionality is migrated to Advanced Collections.

Q1. Because our receivable department depends a lot on Collections> Customer Accounts form in R11i to identify Invoices and aging. In R12.1.3 how they can achieve the same functionality? The only solution seems to be Advanced Collections.  

Q2. We have not setup Collectors in R11i. Do we need to setup Receivables people as Collectors to achieve this functionality in R12.1.3?