I think your starting at the wrong end, and the more difficult (and dangerous) end of things. I tend to work it the other way around, build the audio amplification section, figure out what voltages/currents your circuit needs, then work backwards and design the power supply to support it. I have only recently started playing with tube rectifiers and they are a fickle beast.
For me the Bottlehead Quickie is where i learnt the most about simple amplification design, how to work out load lines and resistor values to set it up, and what each part in the circuit does. Its only $99, sounds great, and runs on batteries so it wont bite you. Highly recommend you start there.