Fp. gardneri is an easy and attractive fish. I'm happy the club is sending you a pair.
Gardneri are very hardy, and eat a wide variety of foods. If the pair you receive don't initially take dried foods, I would try frozen foods such as bloodworms. Live foods such as daphnia, small worms, and baby brine shrimp will be taken by picky eaters and make a great treat. The AKA has articles on how to prepare your own foods, but this makes more sense with a large number of fish.
Most killifish are prone to jumping, so I would recommend a covered tank, or at minimum lowering the water level a minimum of 6 inches from the top. Simple plants like hornwort or java moss are are a good addition to a bare tank. They can be kept in pairs, trios, and larger communities if they is enough space and cover for fish to escape aggression from the dominant male.
If you want to breed gardneri, I would recommend a species-only tank with and a spawning mop to collect eggs. The eggs can be incubated in water, or can be dry-incubated in damp peat moss for a few weeks before re-wetting. If you have a densely planted tank without other species or power filters there's a good chance a few juvenile fish will appear without any intervention.
For more details on care, the AKA beginners guide is a great place to start.
https://aka.org/!area_Public/publicLibrary/~breeding&rearing/akabeginnersGuide/a...