This answer assumes you did not use the extension for unit accounting.
Currently, any legacy logs you have include only two transaction types, Payments and Charges.
Your total cash is the sum of all Payments, from current and previous Scouts. Payments represent cash your unit received.
Your Fees Receivables represent the sum of accounts that have a negative balance, or the net of what is owed to the unit.
Your Payables represent the sum of accounts that have a positive balance or the net of what the unit owes the Scouts.
Assets and net assets are simply calculated.
To set everything up to start using the system with the correct balances, you need to think about cash that was paid out and any other funds that might be in your real life bank account. Up to this point, neither transaction type represents cash leaving the system. Starting with this release, cash leaves either by Member withdrawals, or by charges to the Unit.
To easily set it up, you need to enter a one time adjustment transaction to your new Unit Payment Log. Take your real life bank balance, and subtract your reported Total Cash in Scoutbook. If the result is Negative, add a new Charge to the Unit Payment Log for that amount. If your result is Positive, add a new Payment to the Unit Payment Log for that amount.
For more information, see What kind of financial recording does Scoutbook Provide? - Payment Logs (SB) | Scoutbook Knowledge Base
Once you make your initial adjustment, your transactions in the logs will properly track.