Questions about Maplestory Luminous and equipment in general

Hey, Guys. First, I should say I play in the Reboot World.

I started playing, like, two weeks ago, and I have a few doubts (this game can be very overwhelming):

About Luminous:

1) I'm not sure I understood his Lightning/Darkness system. When I'm in Lightning mode (called Sunfire, if I recall correctly), the skill's description says the MP cost of [Light type skills] would be reduced, but that's not happening. I mainly use two Light skills: Reflection and Spectral Light (MP costs of 61 and 20, respectively), but I always spend the whole MP cost. Why? Is it bugged? Am I not understanding it right?

2) I have 37k MP. Which potions am I supposed to use? And where can I get them? Is it cost efficient? The latter is very important; I don't have much money.

About equipment:

3) When I reached lvl 100 (atm I'm 124 already), I got a box filled with lvl 100 equipment, weapon included. When they are equipped all together, they give GREAT set stats. Further into the game, are there more sets like this? Are there a guide or something for me to learn how to get them?

Thank you, maplers!

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