To answer your questions, the values are 'H' and 'D', respectively. This assumes you are using the 'Header/Detail' format for importing, rather than the 'Detail only' method (which is more suited to an Excel-style layout).
You only need to do this import if you want to handle all outstanding transactions in BankRec now.
It is much simpler to deal with outstanding payments in AP and use BankRec for any new transactions. In this case, all you have to do to set up a bank is to set a bank balance of 0.00. When it comes time to do your first reconciliation, your balance will be off by some amount - just post a single batch entry (receipt or payment) for the net amount of the difference before you finish the reconciliation.
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Regards,
Softrak Tech Support