45 seconds Speaking Structure

Hi,
Would you please give some speaking structure about having an stance and giving reasons about what we chose?
(TOEFL Speaking Question)

What is your favorite sport?
Ex: Personally, I prefer ... . First, I think... . Second, it is... . Finally, I have a good memory of... .

These are examples I know!

Giving stance: Personally, I favor ... / I prefer ... / I like ... / In my stance ... / And so on.

Giving reason:
First, ... Second ...
Firstly ... Secondly...
Initially ...  The other reason ... Finally... (Can I use "initially" exactly like "first")

Please provide me with new sample transitions/examples

Thanks.