Whaleship ; I can say this is one of ultimate goal for long-time player.
You no need to rush or bother with it right now.
And also not neccesery to collect girls until you can change ship color,
because there are stage that you can use your greyship to tackle.

Bond crystal ; Normally you make bond crystal from extract left over accescery.
Selling 3* or high rarity girls is just optional.
Is this shop important? For me it's not important, since here is Nutaku that keep selling girls every week.

Bloom ; You can call it 2nd evol. It will come soon, maybe 2 months from now.
Bloom 5* quite strong, if you lack of 6* girls you can use them.