Determining component values (utilizing theory)?

Hi everybody,
I'm currently designing a MOSFET power amplifier. Since I'm new to analog circuit design, I have a couple of questions to ask:

1. How do you simulate a load on the LTP/driver stage? I experimentally tweaked my component values (using resistor as load) until I had the necessary current to drive my mosfets but when I connected the actual mosfets, my current approached near zero and close to rail voltage! I'm using a complementary push pull output stage configured in source follower. My driver stage consists of 2nd LTP with current mirror.
2. What are the benefits of 2 LTP stages instead of one, I've heard it's performance related?
3. Could you please suggest some links online with practical-oriented theory which would help me determine component values for the LTP, current mirror and current source circuits. The university resources online aren't very helpful in practice
4. Finally, do you take on a more experimental or theoretical approach in the industry to determine component values?

Ps I've heard of this great book 'Art of Electronics' but I can't get it now :|

Cheers

Hi,
I don't have much knowledge about what you are designing, but I could share you a link of the book your looking for. https://www.scribd.com/doc/271175853/The-Art-of-Electronics-2nd-Edition#download

Hope I helped in some way.

It is a preview version, I'll get it in print soon.
Thanks for your reply, and I would be happy if you could suggest people you may know who are into this to answer my question

*UPDATE: *My bad that I didn't realize that a current can no longer flow once the gate is fully charged!! Do you think a charging time of 6 x 10^-8 seconds is reasonable or does it need to be any more rapid for audio applications?

EEWeb Forums wouldn't let me update my question due to a bug