hi again zulu
if the water is deep use clear intermidiat if not floating line at list 3m of leader, as flies i had more success with very dark brown or better black if the water is clear you can use lighter colours as well, i use size 4 or 1 hooks somthing like deceiver type flies don,t make the fly very heavy if the current is slow, let it sink down slow that,s when u get the strikes try small jerk action few times and let it drop of again.i know some other people have diffrent ideas lets see what they say it is nice to read their ideas as well.
have fun vince.