The Flytying.eu channel on YouTube has a wealth of information for European anglers and anglers of all nationalities. Here are instructions for creating imitations of sand eels, goby, shrimp, baitfish, herring, stickleback, and much more. All of these are on hooks like Ahrex fly hooks, Tiemco and Partridge and utilize the Fish-Skulls baitfish heads. Seatrout fishing is great fun and something that the Danish coastline is famous and renowned for throughout Europe. The fly patterns on this channel, are all proven and have all caught seatrouts. I tie and use these flies myself and I hope the fly tying guides here is useful and can help you.