Well its all dependant on the clients requirements and the budget, if the client wishes to automate the entire business process, depending on the magnitude of the clients business operation, you together with the team need to take a decision as to whether it would be easier to break it down into segments or approach it in its entirety.

I cant give u specific tailored advice just by the information youve provided, all i can do is provide some high level guidance and pointers

Maybe initially it would be good to list all the business processes/ sub-processes to get an idea of what you dealing with and then perform a walkthrough of each business process/sub-process

The road forward is much clearer now. Thanks.

Glad I could help good luck