New to cycling, I'm looking to build a single speed for fitness/something to mess around on thats a bit different. Frame wise my friend gave me a Dengfu FM098 (http://dengfubikes.com/product/detail.php?id=119) following a failed attempt to get a project going. I already have a set of freehub wheels however I'm not really sure where to start with the crankset. I know the bike has a BB30 and thats about my knowledge. I've tried looking for guides but a number of sites seem to centre around a fixie build. Open to advice - was thinking about the sram s100 crankset but not sure if this will fit... Any ideas on simple guides to follow/advice or recommend products would be great. Ideally don't want to spend more than £100 on a crank.