1) It doesn’t matter that much what you do, as long as you stick with the basic, multi-joint movements (see below); what’s more important is that you do it consistently for a long period of time (i.e., years), and you train progressively harder as you make progress. That said, you need to avoid injury. Training with weights near your one-rep max is riskier as a beginner, especially without a coach. I like the set/rep progression laid out in the 5/3/1 book listed above. I’ve made good progress on it after doing regular weight training for 15 years; it’s difficult to make progress at that “training age”, so it should work even better for a beginner.
2) In general, you should strength train at least twice a week but not more than four times a week. This does not include conditioning or mobility training, which you should also do.
3) Don’t bother with supplements. Spend your money on a clean diet with lots of protein and you’ll be fine. Since you probably won’t take this advice: creatine monohydrate seems to have the most evidence in favor of its efficacy, but the effect is still relatively small and seems to vary between users. I haven’t noticed a difference when using it.
Remember that there are only a handful of great movements: squat, deadlift, bench press, overhead press, pull-up, push-up, dips, rows, power cleans. Consider the barbell, dumbbell, and bodyweight variations of these and you will have plenty to do without doing a bunch of exotic isolation work.
Book recommendations:
another vote for “Starting Strength” by Mark Rippetoe
“5/3/1” by Jim Wendler. Available here: http://www.flexcart.com/members/elitefts/default.asp?pid=2976
Answering your questions:
1) It doesn’t matter that much what you do, as long as you stick with the basic, multi-joint movements (see below); what’s more important is that you do it consistently for a long period of time (i.e., years), and you train progressively harder as you make progress. That said, you need to avoid injury. Training with weights near your one-rep max is riskier as a beginner, especially without a coach. I like the set/rep progression laid out in the 5/3/1 book listed above. I’ve made good progress on it after doing regular weight training for 15 years; it’s difficult to make progress at that “training age”, so it should work even better for a beginner.
2) In general, you should strength train at least twice a week but not more than four times a week. This does not include conditioning or mobility training, which you should also do.
3) Don’t bother with supplements. Spend your money on a clean diet with lots of protein and you’ll be fine. Since you probably won’t take this advice: creatine monohydrate seems to have the most evidence in favor of its efficacy, but the effect is still relatively small and seems to vary between users. I haven’t noticed a difference when using it.
Remember that there are only a handful of great movements: squat, deadlift, bench press, overhead press, pull-up, push-up, dips, rows, power cleans. Consider the barbell, dumbbell, and bodyweight variations of these and you will have plenty to do without doing a bunch of exotic isolation work.
If in doubt:
Monday: Squat, Bench, Pullups Thursday: Deadlift, Overhead Press, Rows
Three other days: run hills, steep and hard. Two days: rest