Unless you're a cowboy, I would suggest 50mg Tren to start. Also If you are running Test Enth, you should start a week or two early, IMO. The Tren is Ace, I presume... so it's gonna hit you hard and fast. days not weeks.
You might consider Test Prop. I think it's much better with Tren.
GET SOME CABERGOLINE BEFORE YOU START.
I would hold off on Letro unless you are prone to gyno.