My mom's obsession with real life crime shows has taught me never clean the blood spill with bleach, you're best off murdering with gloves and probably a hair net... I'd even go as far as shaving all your body hair right before the crime, burn everything you were wearing during the crime, NEVER TELL A FRIEND OR TRUSTED FAMILY MEMBER, parking lots and some intersections have cameras, if you're going to throw the body in water you gotta make sure it's weighed down good, destroy the murder weapon, guns are too easy to trace back, don't buy your murdering supplies so close to the time of the murder and don't buy everything at once, if you murder on a rainy night dogs will be less likely to be able to follow the scent/but you risk leaving tracks so don't wear shoes that are your regular size, don't bite the victim because they can look up dental records, don't drive your car to where you're committing the murder because tire tracks, don't put the body in your car, murdering someone you know is more risky than murdering a stranger
somehow i would follow these guidelines