Hope Mini Mono issue

Cut a long story short I've ended up with one piston right out on the calliper and oil has leaked. Suggestions as how to restore the piston in place appreciated and instructions for first even attempt at brake bleeding as well if anybody can help. PS i've watched the hope vids but still would like as much info as poss to get me through this traumatic period 
thanx

thanx
'..all the bad cats in the bad hats..'
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and the Hope bled info can not really be improved on.
Parktools :?:SheldonBrown