if you want them to just go on with main beam and your not that savy with wiring your local motorworld /A1 sell "Ring Spotlight Looms " pre wired with all the relays and a fitting guide that a 2 year old could follow.
its realy quite easy.
Spots 12+ to terminal 87 on the relay. ( Don't forget to earth the spots )
12 + Switich OR Headlamp Main Beam to 86 on the relay.
Terminal 85 then needs to be connected to a good earth, for example using the spare negative spade on the battery terminal.
Terminal 30 should be connected via a 20-amp fuse to the positive terminal of the battery i would suggest using a ring terminal, as this will give the best connection.
mick