Please just google these things. It took me about 10 seconds and I've already got a circuit. as for the 1000metre thing, you will probably want to boost the arial output. Alternatively, you could use circuits like **broken link removed** (also found on, would you believe it, google. Just search 1000 meter fm transmitter)
please note, that without a license to operate these transmitters, they may be illegal in your country ( maximum 10meters without a license is common).