Newbie with a first crack at a standard deck, looking for advice!

Using what I had from the codes I had lying around (bought some cards for my wife and I to play with when our niece comes over) I thought I'd take a crack online. This is what I've come up with:

##Pokémon - 19

• 2 Bouffalant PRC 119
• 1 Drampa-GX GRI 115
• 2 Glameow TK-PikachuLibre 1
• 2 Purugly TK-PikachuLibre 24
• 1 Kangaskhan FAC 75
• 1 Kangaskhan SUM 99
• 1 Lugia FAC 78
• 1 Snorlax BKT 118
• 1 Stufful TK-AlolanRaichu 4
• 1 Stufful GRI 112
• 1 Bewear TK-AlolanRaichu 18
• 1 Bewear GRI 113
• 1 Cobalion STS 74
• 1 Klink STS 71
• 1 Klang STS 72
• 1 Registeel AOR 51

##Trainer Cards - 23

• 2 Tierno TK-PikachuLibre 20
• 2 Hau TK-Lycanroc 19
• 3 Professor's Letter XY 123
• 1 Rescue Stretcher GRI 130
• 1 Wally ROS 94
• 3 Potion BCR 132
• 1 Assault Vest BKT 133
• 1 Revive ROS 88
• 2 Pokémon Fan Club FLF 94
• 2 Lucky Helmet AOR 77
• 1 Pokédex BLW 98
• 2 Pokémon Center Lady FLF 93
• 1 Winona ROS 96
• 1 Professor Birch's Observations PRC 134

##Energy - 18

• 3 Double Colorless Energy FAC 114
• 15 Metal Energy Energy 8

Total Cards - 60

So far I've only had one game with it; I won, but the game dragged on for quite a while and I feel like I was doing something wrong. Any advice would be appreciated.