Top laner need some advice
So I've been playing top lane nasus for a while, I find it's a lane and champ that I can be pretty effective at carrying mid late game. Couple things I wanted advice on tho. First the proper use of teleport. I was using is mainly to get back to lane after backing, and sometimes getting to a team fight. But someone said I shouldn't use it just to return to lane, so last night I tried to save it more for ganks bot side. I was able to secure the team 3 kills with it. I just want to make sure I'm using it properly. Second thing, elixirs and when/if I should get these. I watched a gameplay of nasus and the guy bought and elixir of iron. I honestly forgot these things even existed so I was wondering are they worth it? One more thing I just thought of is when should I first back. When I can afford a first buy, if the enemy recalls or roams? Thanks for taking the time :)