There's a term for your sunken chest, I just can't remember what it is.. Anyway, it's pretty common..
Low rep/high weight is usually associated with packing on muscle, and high rep/low weight is usually for toning and conditioning. Whatever you do, make sure you have the right weights- make sure you're able to get to the end of your set, but then again you shouldn't be able to push out many more reps on that weight.
I think that mostly, if you're not trying to be that 'hardcore', that something is definitely better than nothing. In other words, if you're going to lift to work your upper body, just keep the basics in mind, know (or learn) your muscle groups and how to target each, and work each group once a week. Combine groups that are close together or work together to do a complex lift and do them on the same day- for example, bi's, tri's, and chest. 4-5 days a week is nice but not necessary, you could definitely hit each muscle in your body 3 days a week, 2 would even be possible if you don't really want to focus on your legs. On days you don't lift you could go in and do your cardio, but I wouldn't recommend doing both cardio and lifting on the same day.
If you need to learn, I've had a few good informative books, the internet has good info too, the site above is hardcore, abcbodybuilding.com is my particular favorite. If you really want some advice on workouts, I could post some workouts I've been doing, if you want to get an idea.
On nutrition, try to learn what foods contain protein and make it a habit to seek them out, and try to get some after your workout (~40g is ideal in the form of whey). Whey protein is an easy way of obtaining mass amounts of protein, and not too expensive- it can be bought online pretty cheap. Without going too much in depth, I try to keep my diet balanced at a 40/40/20 ratio of protein/carbs/fat, but I haven't been really watching it too closely. That is a good balance, though. Stay away from simple carbs unless it's post-workout.
Anyway, that's the basics..
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What it was like- to live life, before you.. symbiont
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