i think skyhawk is right, kingman offer downloads of the manuals from their site, they are prolly in PDF format which means you need adobe acrobat to read them (availabe freely from t'internet).
But as for turning it on, try the on switch (side of gun, on the trigger frame - left if i remember correctly).
As for firing modes, you are in the UK so anything that is not semi auto is illegal. To change firing modes you press the button on the back of the trigger frame, if it does change one of the top 2 LEDS will come on (the bottom (white) is semi) and this is illegal. But that just means the jumper is in the trigger (chances are you are getting it second hand uk from the way you are talking) so i doubt it will let you change firing modes. But if its in just take it out, its a jumper switch like you find on the back of CD and hard drives, top leftish of the circuit board in the gun, it comes out easy, dont force anything incase you got it confused with something else.
Set Up? Screw preferred propellant in the back and put hopper on top in hole, screw barrel on, put paint in hopper, pull the trigger
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If you want any help there are lots of spyder experts who will help you and i will try, tho my heart is bigger than my brain
. Just post away, its what the internet was invented for!