Ah, then I'd recommend playing the game first!! Y is a ton of fun, and you're going to love playing through it! Shiny hunting can be a fun thing you do afterwards, haha. SRing the Kalos starters can take forever - I'm at 4382 Froakie on mine, and it takes like 5 minutes for each SR, so I think you'd be better off just having fun and enjoying the game first!
I don't know too much about horde hunting, but Paulthagerous could probably help you out a lot more with that. The dude got like 30 shinies in a month!!