First OTB tournament

This was my first Otb tournament, it was a summer swiss and upwards of 30 players attended, this game was in the last round, and as a result of winning this game I won 150$ which is a nice bonus, I'm playing black and my opponent is 1400 rating, I am unrated.  I'm looking for players to analyze this game with me and hopefully point out the major flaws in my thinking, thanks.