1. Do I have to be concerned about debits and credits when I'm entering Journal Entries into the system?
Yes, that's what Journal Entries are all about.
For the most part, you don't have to know much about accounting to use the bulk of the Lynx system.
However, dealing with Journal Entries does require an understand of basic accounting.
They are always entered as "double entry" transactions.
That is, all Journal Entries require both a debit and a credit entry and they must balance.