Novice Coach

I just volunteered to coach for my sons 8u soccer league. I've never played, much less coached. But they were short 4 coaches and now they are point short 3. I'm gonna be honest, I have absolutely no idea what I'm doing. Please, help. Do we stretch, do drills, is there a way to incorporate games to help them? Do you have any tips, trick, dos/don't. Please help, I'm doing this for the kids, but I want to help them not be a detriment to them. I want them to have fun, but I want them to learn and be proud of their gains. Also, it's co-ed if that matters, my team will be 8 kids.