Not going to lie, that is the best title ever. Had to welcome you simply because it was so awesome XD
water changes depend on the bioload. Discus often have 100%
pwc, its the bacteria in the filter that needs to stay there. during a
pwc just rinse it in the old tank water then carry on emptying the tank. what is your tank size and what are you planning on stocking with?
you CAN overstock - if you have fish that prefer it due to aggression, such as Mbuna. however eduguy has it right - you need to watch stocking in most cases and adjust
pwc accordingly.
get that master test kit! i didnt have one, but i left my tank running for 2 weeks with cycling products just in case when i started. you seem fond of the 6 inch range... ha. why not look at cichlids if you have the space?
hope lots of pics and updates to come, good luck!