I understand your sentiment BigBoss for plenty of people who only want to have quick ready-made answers without bothering to invest any sweats. However, the internet is like an ocean of knowledge and it's very daunting to tumbling forward if one doesn't have an inkling feeling of what to look for. So ...
For start, it all depends on your power and bandwidth requirement. Internal matching will guarantee to work at frequencies specified but you may have a hard time to increase your bandwidth outside of their specification, if you don't understand the input Q factor of the chosen transistor. Class A design needs transistor having more power than class AB, B etc because of class A efficiency realistically is at 33%. And the type of modulation also affects your device' selection, so on, so forth.
So grab some books & app notes, like Radio Frequency Transistors written by Norman Dye and Helge Granberg, arguably one of the best RF Engineers during my time. This book will probably answer most of your basic questions that you've listed above, and more. Philips app note SC19, RF Transmitting transistor and power amplifier fundamentals is also a very good app note.