Non-radar transponder codes

I am planning a trip into the Caribbean. My question is: If I have
been given a clearance from a non-radar facility. Because the
facility does not have radar they do not give me a transponder code.
What should I squawk? The same question applies to coming into a
radar-controlled environment from a non-radar environment like
approaching San Juan from Bermuda. Again, what should I squawk prior
to receiving a transponder code from San Juan? I was thinking that
the answer would be 1200 but the AIM says that 1200 is for VFR traffic
in the United States. Should you know the answer, I would also like
to know from where I can find the answer.

Thanks for the help ... Michael