Single speed gearing

Going to use my old Stumpjumper full sus frame and turn it into a Single speed. Anyone suggest the best gearing for a novice and the any chainguides tensioner I may need. Finally what sort of crankset should I be useing. :?
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http://www.bikeradar.com/forum/viewtopic.php?t=12534960
you will need a suitable sprung tensioner to cope with the chain grow.
Parktools :?:SheldonBrown