For that, I'd strive to get endurance before actual strength. Typically, you'd want to go for 3 sets of 8-10 reps per exercise
Now, back to the rep range question, and what's best. As I said, this is an area where individualization is involved. The general guidelines go like this. If you're training sheerly for strength alone, and don't care about size, then lower reps in the 5 to 7 range is a good starting point. If you're interested in strength AND size, then you have that correct already; the 8 to 12 range is best. If you're only interested in minimal size increases and are more attuned to working your cardiovascular system, while keeping your physique well toned and perhaps with an impressive level of definition, then higher reps are advocated. That would be 12 to 20.