sicilian

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Just play and analyse afterwards.
Theory will not help you: that which you study will not happen and by the time it finally happens you will have forgotten.

Play copycat  sicilian in the first hand (as white), also d4 will be mess up with the sicilian defense (1. d4 - c5. 2. d x c) - you can just capture this pawn or play London (2. Bf4 ....) oz play Zukertort system (2. Kf3 ...), actually very powerfull opening system in many blacks answering move. 

Sicilian Defense is so popular and effective opening because it gives Black a comfortable position to defend the King's territory while providing scope to counter-attack the opponent. The opening also creates a position that denies White the advantage that it usually gains as it starts the match.