I was a little late to the party with the Duty Officer system. Just got to Lt C today. One thing I noticed. There is a lack of low level assignments at in the sector blocks we would normally be in at this level. I've been flying around trying to find assignments to do and between the level requirements and the limited numer of duty officers we are given in the starter pack it seems its hard to find assignments I can do. I couldn't even do half the assignments in Delta Volanis.
I would suggest loading up Starfleet Academy and Delta Volnis with large number of low level non-specifc duty assignments to get a little experience and xp under our belt quickly.