Are these OK?

1.

I want to have more than coffee with you. (i.e. a whole meal)

Seninle daha kahveden daha fazlasını istiyorum. (So, you want to have more things, not enough coffee? i understood in this way)

2.

How´s my little Turk?

Nasıl Türkcüğüm? 

Nasil benim küçük Türküm? ( or "benim küçük Türk´üm nasıl?" )

Are both OK? Is this something you can say to a child? to a friend? 

3. 

I´d be surprised if you´ve seen either of these.

Bunlardan herhangi birinini ("birini") seyretseydin, şaşardım.

So, you want to have more things, not enough coffee?

Exactly, coffee only, isn´t enough.