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One of the simplest things you can do is think of one of your favorite Pokemon.
Got it? Good.
Now build a team of others around it that support it with their moves, typings, and stats. Ensure that each member can support others if necessary. Have a basic strategy for this team to carry out (trick room, stall, hyper offense, weather, etc.) as well as a few backup strategies in case you run into a counter. It takes a little bit of studying and field testing. You may have to rework your team from scratch, or just replace a single member. It takes a little time to become acclimated to the competitive format, but eventually you'll find a strategy that works with your playstyle.