This is more of a question of how the gameplay will be, but wouldn't you want this top-down? This'll be like... an MMO right? Well whatever you choose I guess it can work but I highly suggest you cut down on the size of your sprites, A LOT, even Maple Story and Ragnarok aren't too big, you can even look back at old SNES/NES games and see stuff wasn't very large at all, but it still looks great when thrown up, well it tends to be anyway.
I can tell you're having a lot of fundamental issues with art still, its obvious you're still a beginner, so it'd also be in your best interest to tone things down, since it won't be so over-whelming, after all, if this is more than a mockup (Even if it is just a mockup, I still think it would look better and be easier to work in with smaller everything), you're going to have to animate everything, make EVERYTHING, etc. I would suggest picking up some beginner art books, theres a lot of free ones online.