Also keep in mind that all the extra filtration i.e. Quality skimmer, sump, fuge, ect... which helps keep nutrient levels low and often allows for slight overstocking is completely useless during an extended power outage in which an overstocked tank will quickly run out of oxygen.
The general stocking rule is 1" per 5 gal
is a very good rule to follow for beginners.
As Mike said you still need to research each fishes needs.
i.e. Just because following the "rule" of 1" per 5 gal
on a 75 gal
tank which gives you 15" doesn't mean it's OK to put one 15" fish like a Sohal Tang
in it. Other factors like aggression, is it reef safe, ect.. also should be taken into account.
has a great database of some fish that would be good for your 36 gal