We are only lay people here, with a few exceptions, so we can only tell
you what we have learned from personal experience and reading.  The best
thing you can do now is learn as much as you can.   Make sure you
understand all the treatment possibilities available to you and the
advantages and disadvantages of each for cases similar to yours.  Also
make sure the doctor treating you is highly skilled and has a good track
record for such cases.

Many of us have found Patrick Walsh's Guide to Surviving Prostate Cancer
a good source of information, but some have criticized him for having a
surgeon's bias.  He certainly has some doubts about treatment by seeds
as compared to external radiation.   But if you keep his possible biases
in mind, his book is a good starting point.   Also look at
www.phoenix5.org as a source of information and other links.

Having said that, let me add that we need to know two other bits of
information to be able to make comparisons.   Did the urologist feel
anything on digital rectal examination and if so, was the cancer given a
stage designation?  Also, what was the Gleason score from the biopsy?

The therapy proposed in your case is one of several versions of
treatments by seeds.   The external radiation is supposed to supplement
the internal radiation by seeds and the hormones are sometimes
recommended short term in order to make the cancer more susceptible to
damage by radiation.   Long term hormone therapy would usually only be
recommended if it was felt that the cancer had already escaped to sites
distant from the prostate.

For comparison sake, I was diagnosed at age 67 with stage T1c (meaning
nothing unusual on digital rectal exam), PSA 4.5, and Gleason 7=3+4.  I
had cancer in four samples out of six on one side (12 samples total).
My urologist recommended either external radiation or surgery.   I chose
surgery because or a variety of reasons, one being that I would know
from the post surgical pathology report pretty well what my long term
prospects were.  I did pretty well.   The report showed cancer
restricted to the prostate.  I have had no evidence of spread since then
(over three years ago), I was continent within a month of the catheter
being removed, and I eventually gained a reasonable degree of potency.
 However, even during the 18 months when I was more or less totally
impotent, we managed an active sex life using a pump.  I suppose I was
fortunate in that I had a very good surgeon and my cancer was constrained.

Good luck, whatever you decide.