check out
www.sgs.gov.sg
you should be able to find information there.
the yield should be higher than comparable bank fixed deposit rates. Min denomination should be 1k if i remember correctly. One key distinction from fixed deposit is that the price of the bond may vary from the date of issue to redemption, so if you choose to sell (ie "withdraw your money") you are subject to price risk (ie get back less/more than your principal). Of course, if you hold till maturity, you are guaranteed to get back your principal.