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Yup, watch videos and learn.
As long as you know type effectiveness, the physical/special split and how to put a team together with the right moves/EV's, you're good. Smogon can assist with this.
It's on Pokemon Showdown, not 3DS.
If you can build a team and know that running Sludge Bomb on a max SpA Excadrill is a bad idea, then you're just fine.
Season 1 is here: Pokemon Showdown League
Who is interested in playing in season 2?
You must be familiar with league format, team building and such! No noobs.