I am just starting my bookkeeping business. In my current job, I use QB Desktop Plus 2019.  I assume I can keep all my customer's 'books' on this program just by creating new companies? Is this a good understanding?

I was wondering which QuickBooks program is best for an independent contractor?  Do you all have a checklist for adding new clients and one for setting them up in QB?  Thank you. Any insights would be appreciated!