Obligatory @Anjo548W guide posting:
The Guide to Getting Sponsors for your Robotics Team - VEX V5 General Discussion / General Forum - VEX Forum
Realistically you could get a parent of a team member to be your coach (I think legally your team contact needs to be an adult on the RE side). Honestly although they would not be able to provide as much assistance as an actual robotics coach (experienced one) would be able, it should satisfy your need for an adult/coach. I personally know of a few teams in my region that have their teams set up this way, and it seems to work out just fine for them.
Good luck this season, and I’ll definitely be rooting for y’all. I hope y’all do well, but above all else, have fun this season! Robotics can be stressful at times and don’t let these issues prevent y’all from having a rewarding season!