I am sarcastic and let me ask you what do you know about cooking and how comfortable you are in this art?
What ever you mentioned are needed for sekuwaa. As I said it is an art and how comfortable in steering the spoon makes the difference in taste as well forget about the ingredients and marinating.

Main point : Slightly difference in mixing ingredients makes difference in taste, so you have to do  it in trial basis and you will know which taste you going to like it.

I  not use garlic and ginger paste, they do not give same flavor as minced.