Your frame will have a french bb with a spindle length that isn't ideal for single speed(setup for a double on the front), I personally wouldn't change it apart from maybe taking off the smaller ring so it looks more like a single. The range of ratios you can get with swapping the back is huge, I haven't done loads of fixed riding as I like freewheeling but start out with your 49t(???) and a 19-21t on the back as smaller than that could kill your knees... I find this chart gave me a good idea, 46/16 was crazy heavy for me and then 46/19 was a nice world of change.
Your frame will have a french bb with a spindle length that isn't ideal for single speed(setup for a double on the front), I personally wouldn't change it apart from maybe taking off the smaller ring so it looks more like a single. The range of ratios you can get with swapping the back is huge, I haven't done loads of fixed riding as I like freewheeling but start out with your 49t(???) and a 19-21t on the back as smaller than that could kill your knees... I find this chart gave me a good idea, 46/16 was crazy heavy for me and then 46/19 was a nice world of change.
Also buy the stars, everyone needs the stars...
http://www.ebay.co.uk/itm/361023538285?_trksid=p2060778.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT