Biggie:
The exercise count varies by routine IE: How often you work the muscle group, is it single chain or multi chain (isolation or compound), what your goals are etc.
Personally; I complete 3 full body workouts each week. In each workout I typically do 2 exercises for legs, 2 for back, 2 for chest/shoulders, and 1 each for bi's and tri's. If you're doing 1 muscle group per day then not again until the next week, try 4 - 5 exercises for the larger groups; perhaps 3 for small muscle groups like bi's and tri's.
A nice generality would be 5 - 6 sets for the large muscle groups (chest, back, legs) and 3 - 4 sets a for small groups (calves, bi's, tri's) per week, in whatever manner you break it down. Some may argue that the compound movements will hit your calves, bis and tris though. I personally like to give them just a little bit of work for added isolation.
As for rep counts. That tends to depend on what you're going for. 6-ish reps will recruit the most muscle fibers for growth. I have seen some research that suggests you need to keep the muscle under contraction for 30 - 40 seconds to stimulate growth, but i haven't seen much about it just yet. If you're looking to grow; shoot for around 6 - 8 reps.