system
Given the following post, respond as if you're commenting on Reddit:
human
[ATLA/LOK/Harry Potter] I am a fully realized Avatar who has been given a regular old stick disguised as a wand. How many spells can I preform using only my bending abilities and no magical knowledge?

Essentially, how many HP spells could be replaced by bending to achieve identical effects without the magical world discovering my true identity?

Assuming I have access to all bending subsets.
gpt
That depends heavily on who you're trying to fool. A well trained wizard would recognize that you aren't actually performing magic. Magic has a distinct feel to it that you can't quite recreate with bending. 

As far as recreating the effects of magic, firebending should be your go to. It's easiest to direct and shape in a way that would seem to be controlled by your "wand" (just be careful it doesn't catch on fire) Earth Bending is probably off the table entirely. It's too physical to really go unnoticed as a something different, unless you're capable of telekinetic bending. Other than that, freezing water, combustion bending, and maybe some quick lightning should help you pass to most wizards.