If I want to lose weight, should I first gain muscle?

If your main goal is to lose weight, your focus should be on nutrition rather than the types of exercise you are doing.  You will not be able to out exercise a diet that isn't aimed at your main goal, meaning, if you're in a caloric surplus and you're trying to lose weight you're pretty likely to fail.

With that being said, you are right about the increase in muscle.  As you increase the amount of muscle you have, you will see an increase in metabolic rate.  Though you should keep in mind that this takes time and shouldn't be relied upon to lose weight.  Again, your focus should be about controlling the amount of calories you are consuming first.

As Kevin stated, it isn't an either or option here.  You can do both aerobic training, along with anaerobic training.  You might also be interested to know that most physiologist now recommend doing a mix of both.  Typically you see recommendations of 3-5 days of cardiovascular training at a moderate to heavy intensity, while completing 2 or 3 days of resistance training.

For somebody very overweight how many hours per week to workout to start?

I've trained very overweight people who are in good enough shape to outwork most

What are some of the simple physical fitness tips for beginners?

Keep it simple. Start off with some very basic exercise like walking or riding a bicycle. If you go to a gym it is routine to have the staff show you around and explain how different machines work. Don't be shy-continue to ask their assistance when you return for

Have you ever had a moment when you suddenly realized that you were the problem?

Absolutely! In my late twenties-early thirties, I had a lot of problems with co-workers and co-students. I was under a great deal of stress, working full-time while going to school full-time. One of my nursing professors said to me something along the lines of