start all over Help please

Hi-inexperienced user w/QkBks 2008 pro. Inherited billing/invoicing etc for condo POA. I know maybe qkbks may not be the perfect app for this, but it's what we have. Many mistakes were made, banking not enterd, invoices delted, etc. We want to strat all over using a recent bank statement and entering all checks from ?? a date we choose (statement) Any auditing going back can be done with hard copy bank statements and checks. Invoices were just sent out (56) for the 4th qtr maintenance fees. Any special advice to a newbie is needed and greatly appreciated. I have access to any bank staements I may need and canceled checks. I wanted to strat with receiving payment on the 56 invoices when they come in and depositing the payments in bank account (was always senbt to undeposited funds , that's part of the reason we are starting over and hopefully will do it right this time. Frank in Florida needs your help