Some really basic questions from a new player:

[SixDaysShort]

Hi all, just downloaded the game about an hour ago...and am still figuring everything out. I'm sure I'll have more questions as I progress. But, for now, mine will focus on fleets, exploration, and harvesting.

1) Just testing out fleets, I attempted to create miniature harvesting fleets including one small harvester and one fighter in each. However, I was unable to add fighters to the fleets for some reason. Why is this?

4) when you send a harvester to a source planet that has RO, what determines how much of his cargo is filled with RO as opposed to CO?

*edited to remove questions I've learned the answer to