Try to get a starting relic so you can alow trade for yourself and adc vs heroes with no sustain.I recommend to you to get a 0 9 21 masteries that will provide you enought mana and mobility without boots for early engages or escapes.If you do not feel too sure of that, take tanky masteries and run a first item Mikael's.ako make a lot of magic damage and have many cc recommend that you go first to the solarium as you will, and a tank for your team and you run team fight in any case, try to get one after bačka go back with enough gold for sight stone, in the event that you have taken the first blood can improve relic and get a ruby for furder tankyness in lane,but dont forget to have atleast 1 ward with that so you can ward a bush or objective.

I play thresh a few years now,and i find a build that works the best for me lately.for me its all about tanky thresh on start with a lot of hp early since he has no armor on starr so he can be bullyed very easy.