200+ sprites did the original PoP use for the prince, and 23 sprites for any guardian. 8 Guardians and the Jaffar. For the scelleton I don't know. Haven't found the Sprites for it With the Spritesheets and Spriter it's not that hard to make all the sprites.
The tons of events, yeah, I even can't imagine how to start with all that events Long way to learn C2 first.
if you have the art its easy to program , cause you know how things should look and how they should interacting, its harder to program a game when you have no graphics and have to squueze your brainz out for"i think i remember looking like this" .... happens alot of time even if you have part of animations/sprites/ or engine blocks to play with... the thing is if u dont have ALL sprites dont bother starting programming a game u want to finish... cause its not gonna be finished because u wont know how will look.... so the programming , graphics, audio, stroy etc its all related .. its ok if u have skills in all those areas but u should focus on wich u like and love and maybe find some friends to team up:D the best advice i can give u right now... im a solo dev, doing art,graphic,programming(mostly from tutorials since i dont have no programming school or training outside construct 2 and some similar engines.),about audio i can doodle around and maybe export a wav format out of a mp3 and viceversa but not all the time...
hope your game is gonna be ready soon... dont lose hope ... if u choose doing it yourself and u are young.. you have time ... alot learn now.. dont worry about money... if u arent young anymore then... its kinda hard to do this while u have a dayjob... requires alot of time... seen people selling their homes for it ...