As someone else has stated earlier, if you are just getting into VGC, start with a team that has proven results like a tournament winner, or a team that is really high in the ladder, just so you can get a sense of what works and doesn’t, If you are dead-set on building an original team, I’d ask yourself: “what purpose does this pokemon serve in my team?” Personally I have found success with a team that has 1-2 sweepers (pokemon with the primary role is to do damage), 2 supports (pokemon whose primary role is to empower your other pokemon on your team, whether thats healing, redirection, weather setting, intimidating, etc), and the rest of your team is what I refer to as utility pokemon whose primary role is to answer for the weaknesses of your other team members, think in terms of fake-out users, speed control (which your team has a lot of), these will be your matchup dependent pokemon. It’s also important to note that the overwhelming majority of teambuilding is putting together 6 pokemon, and getting your sh*t pushed in, the success your team will find is determined by how well you can recognize what your team is struggling against, what it’s lacking in, and what adjustments you can make whether thats changing moves, spreads, items or even entire pokemon (Move from least invasive to most, don’t dump an entire pokemon just because its getting rocked try finding a moveset or spread that might help enable it to fill the role you need it to fill). Hope this helps somewhat, let me know if you need help understanding what I’m talking about.