My stricture was congenital, but it was made worse by a traumatic catheter placement as well.
Where they enter your body for the surgery all depends on where the stricture is. Apparently yours was in the proximal penile if they went through the scrotum. Most of us have perineal incisions because ours was in the bulbar area.
I wouldn’t worry about the discharge. Its just a mixture of blood, urine and other normal bodily fluids caused by the healing process and the irritation from the catheter. It should go away soon.
I had to sleep without a blanket on me for a while because my erections were painful against the covers. Coating the part of the catheter tube that your erection covers with Vaseline can help too.