You will need to go to the Flight Standards District Office (FSDO pronounced FizzDough)
There you can fill out an FAA Form 8710.
Issued on the basis of a Foreign licence, usually takes about 1/2 an hour. If you are going to a flight school to rent they will know where the FSDO is and should also know what to do. You will receive a temp certificate immediately and the "real" one should arrive in about 2-3 months to the address you put on the form.
It will carry all the restrictions of your CAA licence and will not grant you full FAA priveleges. (No night flying unless endorsed and i believe no over the top operations).
Hope this helps
FYF
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Oh no,not again!
[This message has been edited by Flare_you_fool! (edited 01 December 2000).]