I agree with his assessment of not doing cardio on weight training days, except perhaps for a mild “warmup” for your muscles.
As far as whether to rest or not between sets? It’s pretty much a personal preference thing.
Resting allows you to “recover” from your last set, and hopefullly “ramp up” for your next set.
I tend to rest for anywhere from 10 seconds to a full minute between sets, depending upon how impatient I am that day.
For a newbie at weight lifiting? I’d definitely recommend waiting that full minute rest, until you become confident in your routine/form etc and get your stamina up there.
As to the “I’ve been doing this for X years” people? Give us a break!!
Sorry, not snapping at you, just the mentality.
Form is what is important. Making sure you don’t just “sling” the weights around. Make each movement count, both on the lift and the release (which both have correct scientific muscle names that I can’t think of right off the top of my head, :D).
Lift sizes that work for YOU. Don’t try to lift based on what you see other people doing.
A good rule of thumb is that for your “warmup” set you should pick an amount that you can semi easily lift 12-15 times.
Your next set you ramp UP in weights and lower the reps and you should be finding it a bit harder to finish out the whole set.
Of course there are many MANY different types of “sets and reps”. Ramping is just one way.
Some people lift the same weight for 3 sets of 15 reps.
Some people do what they call “holistic sets” (from an exercise/weight loss board to which I belong, not sure if they made up that particular name, or if that’s the correct term).
Anyway, those of us to whom this type of workout was given soon came to call them HELListic sets.
That type of workout consists of starting with the HEAVIEST weights you can stand for 6 reps.
Then ramping DOWN to approximately 2/3s of that weight for 10-12 reps, and finally, with an amount you usually use for warmups, do 40, (yes FORTY) reps.
You will be whimpering like a small dog by the end of those!! hehe.
Muscle and Fitness has some great information. So do a lot of the men’s magazines, and there are some great women’s mags out there as well.
Also, some good books on weight lifting. IMHO? I’d ignore your boyfriend’s macho posturing, get some good “how to” books, and learn and do it at your own pace.
Good LUCK!!!