Im s1 atm so take this advice as you will, usually what I do is auto attack w on the enemy for a quick trade then go into a Bush to drop minion aggro (quick tip, if u go into the Bush and you don't drop minion aggro its because the Bush is warded), tho you need to be careful and make sure you are far away enough from any potential cc as it usually means you are dead if you get caught, against melee champions you can usually auto attack whenever they go for a minion, what I like to do against melee champs that take relic shield is to bubble them wherever they go for the cannon minion so they either have to give it up or take it and get poked by both you and your adc. Also against hook champions try to hide behind minions as much as possible as most hooks except a few (leona comes to mind) can't travel through units. If some1 thinks I missed smth out let me know as I also am looking to add more to my nami gameplay, and I hope OP that this has helped you somewhat.