Sabahleyin derhal seni arayacağım.
- I'll call you first thing in the morning.
Yarın sabah derhal ayrılmalıyım.
- I have to leave first thing tomorrow morning.
Sabah hemen orada olacağım.
- I'll be there the first thing in the morning.
I would help you, but I don't know the first thing about gardening.
I'll meet you first thing at the station.
... And then like what's the first thing that you do? ...
... The first thing he said was he hated the internet. ...