Dry starts are super useful for low tech tanks allowing you to establish a carpet when it otherwise wouldn't be possible. If planning to run co2 anyway it has less utility. If plants start yellowing or growing mold it might be time to flood. They could be yellowing from a variety of reasons including, transition stress, damage when planting, drying out too much, or not enough fertilizer. Since this looks to be an aquasoil type substrate this last is not likely.
Speaking of. With any aqua soil type substrate, you need to be doing a lot of water changes when it is new. So if you flood, you should be doing a 50% water change everyday for the first week. Every other day for the second week. Every 3 days in week 3. And twice in week 4. Thereafter once a week. This will help manage the massive amount of nutrients aqua soil type substrates leech in the first few weeks.