I would like to say :
First, I would like ...
Secondly, I am ...
Finally , I think ...
is it correct ? and what we call this kind of structure ? is there alternatives ?
I would like to say :
First, I would like ...
Secondly, I am ...
Finally , I think ...
is it correct ? and what we call this kind of structure ? is there alternatives ?
The words first, secondly, finally are called linking words. They introduce the sequence of events in a story, narration, etc.
There are plenty of alternatives:
Following, Later, Once, Next, Subsequently, Thereafter, First, Firstly, Initially, To begin, Next, Second, Secondly Then, Third, Thirdly, Finally, Last, Lastly.
As for your sentences, they are correct.