Good suggestions about the references to read before building an amplifier. I studied many of those myself before I built my latest legal limit amp.
What I didn't see suggested here were the many pages at http://www.w8ji.com/Amplifiers.htm
. I studied those very carefully, and I think my amplifier works better because of following Tom's tech advice there. He has designed many amateur and commercial amplifiers in common use today, and he knows what he's talking about.
The last thing I would read is anything printed by the ARRL. They have some good stuff, but I've just seen too many errors in their publications --especially about amplifiers-- over the years.