A: 55 is way too big, I don't use tanks but 10-20 gallon seems to be the norm for younger snakes. I would look into tub setups, they are much better at providing proper temps, humidity, and security than tanks (just my opinion).
B: Aspen is fine, and I simply use paper towels for substrate. Easy to see poop and urine and possible mites on paper towels.
C: Not sure about bulbs to keep ambient temps up in a tank, but you don't need a lamp/bulbs with a tub setup. Just a UTH (IMO you need a UTH with a tank too: with a thermostat so it doesn't get too hot and potentially burn your snake).
D I like ~80 degrees ambient temps during the day time as long as they have a cold and warm side to go to. My nights drop to around ~76 and I have no problems with that.
E Humidity around 50% is good. Some people like to raise it when the snake is about to shed and you may need to do this in a tank setup as tanks don't hold humidity as well as tubs. I never need to mist my tubs to have my snakes shed fine.
F Sorry, don't know about the bulbs again.
Hope that helps a little.