Zero. But even that is not a guarantee for ranking, speaking from my own experience.

I rarely go over 30. Result: more than 50% of my posts are on the top page.

Remember QSR is meaningless. Your true competition is USR, see more here How to choose SEO keywords

Well the lower the better is the best QSR rating.

But as a guide anything below 200. Personally I target below 100.

Normally it should be under 200 I think. Ideally, under 100 it is really good and you are aiming for the lowest possible, as long as you have some traffic as well.

Yes Jeff, I think it's too broad to be a starting niche. You will get a targeted audience if you're more specific. Later on, you could diversify and expand to golf equipment.
Hope this helps!
By the way, I live in Montreal (Quebec). Hello neighbor!