By the questions you are asking it sounds like you are planning your first cycle.
Testosterone does not raise prolactin levels in the body but it does aromatize into estrogen so an AI like aromasin is needed.
250mg/week is also an extremely low dosage. You aren't going to notice much from that. That's basically a TRT dosage of testosterone. Most people (and this is what I recommend) will run 500mg/week for their first cycle.
Check out this video I made on how to run a first steroid cycle -> https://www.youtube.com/watch?v=qqBLCSaKsW4
In this article series I explain how to do injections -> https://www.evolutionary.org/forums...er-injection-techniques-–-part-2-a-49351.html
Here's what I recommend:
Weeks 1 - 10
testosterone e or cyp 500mg/week (inject 250mg twice per week)
aromasin 12.5mg every other day <- very important to prevent against estrogen related side effects like gyno and water retention.
After your cycle run the perfect PCT protocol: http://www.evolutionary.org/the-perfect-post-cycle-therapy-pct/