If my argument/answer to a question involves a list of arguments/reasons/examples, I want to understand what is the "right" (or best) way to introduce these points. Which among the usages below is right and should be preferred?
First,/Firstly,/First of all,/Most important reason is...
Second,/Secondly,/Another (what if I have 4 points how could I use this to introduce the 3rd point) important consideration is...
Finally,/Lastly,/Last but not the least of all the reasons is...
Thanks.