I've been searching the internet for good advice about female weight training (and weight loss) and frankly not come up with any good info. (excluding one very good site/blog written by a female Canadian academic).
I'm losing weight steadily from a calorie controlled diet, but I want to lose 50 pounds before I do any hardcore aerobic exercise because I have a number of health issues to deal with (most notably arthritis in my knees which I developed from doing too much exercise during my childhood....ah the irony!!).
So for the first half of my weight loss, I want to concentrate on lifting weights - first, because it doesn't irritate my health issues, and second, I love doing it!!

I'd be grateful if anyone can help me with the following issues:
1. How often can I weight lift? Is it okay to do it every day or should I be doing it every other day? Will I bulk up if I do it every day? (I know women generally don't bulk up). I'd like to lift everyday as I'm not doing much aerobic exercise.
2. How long should a lifting session be? At the moment, I work my way through a chart of exercises and it takes about 30 mins (exc. warm up). This gets me out of breath and a little sweaty. I work my way through an chart of dumbbell exercises.
2. Currently I'm just using dumbbells at 1.5kg and 2.5kg weights (I work my legs doing lunges and squats). Is it better to do fewer reps with a heavier weight, or more reps at a lighter weight? Ultimately, what's the best for weight loss/toning?
3. Am I missing anything important here that I should be doing?? Am I sounding dreadfully naive?

For now, my aerobic exercise will have to be some brisk walking. The concept of 'splits' sounds an excellent approach - I'll certainly check that out. I find smaller weights and lots of reps results in breaking into a sweat (and hopefully a higher heart rate), so I may stick to that for now since there is no one right or wrong approach.