Please Analyse My Memorable Game

I'm a Beginer. I've learnt to play chess just a few months ago from my cousin. Here I've just played a game with him and I've(white) WON!! (He is a very good player and it is my first win against him). Here is the PGN:(suggest me where should I have improved) 1. e4 e6 2. d4 d5 3. e5 c5 4. Nf3 Qa5+ 5. Nc3 Nc6 6. Bb5 a6 7. Bxc6+ bxc6 8. Bd2 cxd4 9. Ne2 Bb4 10. Nexd4 c5 11. Nb3 Bxd2+ 12. Nfxd2 Qc7 13. Nf3 c4 14. Nd4 Rb8 15. Qc1 Qa5+ 16. c3 Ne7 17. O-O O-O 18. b4 Qc7 19. Qc2 Ng6 20. Rfe1 Bb7 21. h4 Qd8 22. g3 Ne7 23. h5 Nc6 24. Kg2 Nxd4 25. cxd4 Qb6 26. a3 a5 27. Rab1 axb4 28. Rxb4 Qa5 29. Ra4 Qc7 30. Rh1 c3 31. Ng5 g6 32. hxg6 hxg6 33. Nh7 Rfd8 34. Nf6+ Kf8 35. Qc1 Qc6 36. Qg5 Qxa4 37. Rh8+ Ke7 38. Nd5+ Kd7 39. Qe7+ Kc6 40. Qc5+ Kd7 41. Qc7++

Sorry wowiezoie I'll edit it. I wanted to mean 'master' in another sense.(As he has taught me chess)

Thank You.

You were lucky to get away with 5. Nc3. By move 9, he had a dominating position on the Q-side and center & should have played more actively with that advantage. Instead, he let the game get diverted back to the King-side, which you shredded and used to mate him. A good novice effort!