SIDS-help!

My fiancé and I are trying for my first and his second. I have been reading and I am terrified of having a baby and it die from SIDS! I know they say there is no cause for it but it scares me to death I don't even know if I'll be able to put my baby down in a crib. I'm not gonna put a sheet in the crib I was thinking of buying a couple blanket sleeper onesies. Kinda worried the baby will get too hot. Does anyone know of a good book or website to check out or personal story? Anything I can do to prevent it? Is It from sleep apnea?