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@vinylvillain
Chainring:
First you need to ascertain what BCD pattern your cranks are - different cranks have different bolt patters, and different length arms - your existing chain rings will probably have what the BCD is on them somewhere - your new Chainring needs to be the same bolt pattern and BCD to fit onto your exsisting cranks
Yo also need to make sure that the chainring you buy is for a 1/8 chain, as this is what you will be using for SS - The SRAM chain you have indicated is fine for that.
Chain Tensioner:
I would use a Surly Singulator, prob the best tensioner out there, they also do a spacing kit - most spacing kits are designed for shimano equipped bikes, so again check compatability
http://www.surlybikes.com/parts.html
Gering wise you probably want from 46-48t on the front and an 18t on the back - most OTP SS bikes come with this gearing and it is a good place to start.
Here is my converted SS with Surly Singulator, though the rear wheel has a DMR Revolver SS Hub - if you have the cash i would reccomend building a new wheel on a specific SS hub as it will be a lot better.
As for tools - prob cheaper to pay your local shop 40 quid to put it together, as the tools will prob cost more