First photography gig, a quinceanera, sweet 15

So a coworker of mine wants me to be the photographer for his daughters sweet 15. Im no professional and he knows it but still he wants to give me a shot. I did a photoshoot of my friend at the beach about a week ago but still feel like i need some improvement.

The sweet 15 is this Saturday, any pointers? I have a Canon T5 and a 6D with a 24-70mm f2.8L lens, a 50mm prime lens, a 60mm macro lens. I also have a Speedlite 270 ex flash. They want to go to the park to take some photos before the churxh service and he also wants me take some pics durning the service ans of course later a night durning the party and the dance as welk. So im getting nervous and excited as the day draws near and well just looking for advice. I do plan on shooting on auto with a but of manual settings as well, the party is gonns be outdoors also. Thanks in advance!

Edit: link to one of the pics since i dont have all of them up yet

https://1drv.ms/i/s!AnEXI_S7Nx9ehbYTTrHMl5pJmCnhhw

The photo was taken with the T5 using the 24-70mm lens