Dayum you are being contrary today. I was addressing the fourth issue first.
Reps per set ...
Normally I start at whatever my most recent 15 strong reps weight. If that's easy, go up 5 lbs (or whatever is the appropriate weight interval for the exercise) and do 8-12 with tight form. Again if I can go 12-15 with tight form, the weight goes up again.
But, since I'm "in therapy" for my lower back, my weights in general have gone lighter & I'm focusing a lot more on core strength. But still the same guidelines. Rep number is driven by form.
Question 6: How many take a good multi-vitamin & multi-mineral?
I take the vitamin, but I keep forgetting to stock the multimineral - I like the Twin Lab stuff. Currently using the store-brand at Whole Foods (just cuz it was convenient).