seedlings

I decided to grow my own flowers this year from seed. I dont have a greenhouse so my laundry room has been taken over by seedlings.

My lupin seedlings are about 3wks old, 6ins tall with two leaves. Question is do I just leave them alone untill its time to harden off?

My next question is about my carnation seedlings. They are the same age but smaller. The problem is that the leaves are starting to curl under slightly. Intuition is telling me that maybe they are too wet and would like some more sun so I've put them onto a sunny windowsill. Can anyone tell me if I've done the right thing?

Thanks
Odina