I would recommend these:
Strong Badia The Free - Best overall episode of SBCG4AP. Very funny, very good story for an adventure game.
Baddest of the Bands - This is hands down the funniest episode of SBCG4AP. I was bursting out laughing multiple times. The story gets repetitive, though.
Fright Of The Bumblebees - This was an okay episode. The plot wasn't very good but the humour was alright.
The Last Resort - If you must choose one W&G, choose this one. This has a great plot, great length, and great humour.
Muzzled - It was a great episode, I just don't feel you should start the series with this particular episode, It would just seem... off.