A Whistler, Pink Thing and a simple baitfish streamer make a practical starting box. Carry different weights so you can fish shallow cover without a heavy splash and deeper edges without a painfully long wait.
For a general starting outfit, consider a nine weight with a floating or intermediate line and an abrasion-resistant leader. Match the outfit to the fish, fly size and cover; there is no single tippet choice that suits every barra water. Keep the fly easy to cast accurately.
Begin with a short retrieve and pause. If the fly passes above the cover, allow more sink time on the next cast. If a sighted fish follows, keep the presentation controlled instead of snatching the fly away. Strip into the weight of a take and keep the first moments of the fight clear of loose line.