Chain looks very slack from the pic.
Sheldon's website has loads of info about fixed gear bikes, general bike maintenance etc...
Here's the page about chain tension http://www.sheldonbrown.com/NEW-chain-adjust.html (Adjusting chain tension right at the bottom).
Buying sprockets and lockrings - there are loads of makes, and you can get them loads of different places. What size are you're looking for? Here's a good calculator to work out speed at cadence, skid patches etc...
http://www.bikecalc.com/fixed
@iamtwilliams started
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Chain looks very slack from the pic.
Sheldon's website has loads of info about fixed gear bikes, general bike maintenance etc...
Here's the page about chain tension http://www.sheldonbrown.com/NEW-chain-adjust.html (Adjusting chain tension right at the bottom).
Buying sprockets and lockrings - there are loads of makes, and you can get them loads of different places. What size are you're looking for? Here's a good calculator to work out speed at cadence, skid patches etc...
http://www.bikecalc.com/fixed