Your first mistake is Nc6. The whole idea of 1...d5 as Black is to eventually break in the center with ...c5, and your move blocks the c-pawn.
4...e6 should be 4...e5. White has played meekly so far and you are lucky to have the chance to challenge the center.
6...Ne7 wastes a move. Consider 0-0 or e5.
7...c6 doesn't hurt, but 0-0 or c5 would be better.
9...Qc7?? loses a piece for two pawns after white's e5. You must contest the center here with 9...e5
The opening is a fight for control of the center. When you're playing Black and respond to 1 d4 with 1...d5, your primary objective is the freeing maneuver c5 or e5; if white gives you the chance to make one of these moves sooner than later, take it.
This is my first time making a board on a post so i must have messed up. The board stops once you get to move 9 but if you click on move 9 in the Move List then it will progress through the rest of the game.
I played black in this match and eventually won by checkmate but I was really inefficient in getting it. Any thoughts or ideas on how I could have played this game more smoothly would be much appreciated.