I mean, theres a lot of ways you can start one, by jumping, maybe doing a kick, maybe some tricking before the spar. There's really no limit when coming to spar openers.
i usually open with some sort of spin. a really popular way to start a spar is by doing the horse stance, and flow into a spin of kick. it's very diverse. try contacting one of our teachers and they'll get you set in the right direction!
I usually start by sidestepping and going forward then kick...
If you want to get more tips from players, then join these discord servers:
Tori Academy: https://discord.gg/XBPbYNu
TB Sparring and Sparring Community: https://discord.gg/gFr9qED