Thanks for taking the time to look at my build! First off I would like to say that this is my personal build which I combined with the build of a Diamond main thresh player. I really recommend it, especially since it has 3 seconds cooldown on your hook (which is OP in teamplays if you use it right), but you can always try to mix your own items in :)

It's probably not correct, but start with Q. For the second skill I usually choose E, since you can pull Champions under the turret and use E to keep them in there longer, which guarantees First Blood. If the opposite team does a lot of damage, I recommend upgrading your W first. From here on, just max your Q and put any other points in W, and last E.
Also, upgrade your R whenever you can!