Hey mate,
As stated above the fuses you will need to check/ replace are located in the panel to the right of the steering wheel. Look where the bonnet release lever is and follow it straight up and you will see it underneath the dash dimming switch if i remember correctly.
Your problem with the car's idle is most likely a fuel mixture issue. Your carby will have two screws near where the accelerator cable is hooked up, one screw for idle adjustment, one for mixture. Base setting for mixture is normally around 1.5- 2 turns out from memory. Also check your points gap is 0.5 and your timing! However I suggest you taking it to a mechanic though if your uncomfortable, then watching him and learn :)
Cheers,
Justin