That should be well outside of your comfort zone - no DM, less than perfect conditions, and deep.Charter is the Gulf of Mexico NW FL. Offshore bridge spans and wrecks. No DM going in the water that I know of.
At 15 dives, most divers would generally stick to OWD limits. 4-6 dives outside of training is very little unsupervised experience. Essentially, whoever you're buddied with will have to act as your guide and DM - you just have to hope they're up to the task.