I want to get this game but have no prior knowledge of programming. What skills should I have in order to play this game, and where could I learn Basic language online?

Do whatever you want buddy :) Whenever I get new games I always play and learn it as I go, which makes the game more thrilling and awesome! That's my opinion, but be you :)

You're looking for http://smilebasic.com/en/beginner It's the official SmileBASIC coding tutorial which teaches you everything. Keep in mind, learning to program from nothing is a lot, A LOT of work, and most people do not make it past the beginner level. But like every computer scientist says, once you learn one programming language, you learn every programming language.