Manage Payment Documents,How to use 'Checkbooks' in Bank Account Setup

Hi Experts, 

I want to know how the Oracle Bank 'Checkbook' process is done in conjunction with First Available Document Number, Last Available Document number

The requirement, is we have the 'Checkbooks' that have different serial numbers. Example: One check book will have 1000 as first check leave number as 1000 and last 5000. Next check book will be 8000 to 9000. The first and last available numbers keeps changing. How do we setup the first and last available documents?

if I have already defined different check books with different start and end numbers, after the end of the last check number, say 5000,  will the system move to the next check book and start with 8000 number automatically? If I need to enter 7999 as my last number issued, what is the purpose of entering the checkbooks and the numbers? In this case, even without Checkbooks, I can always enter the last number issued as 7999  and the system will generate the next number and continue until it reaches the last available number.