You sound pretty well prepared

Your room is going to give you response peaks around 28, 56, and 84hz because of the square dimensions. You might want to think about putting the sub at or near the middle of a wall rather than in a corner to help smoothen the LF response.

Starting with 70s music is a great idea IMO. I still think those albums were some of the best and most careful recordings you can find. Enjoy !!

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8