Blood Sight and Death Mark are Necromancy rituals, and require dedicating an Initiation to the Necromancy school (by picking the Grave Binding ritual instead of a metamagic for that Initiation) before you can learn them by paying the regular 5 Karma per ritual [Street Grimoire, page 143-144].
Death Mark [SG, p127] makes it possible to follow a corpse's trail back to the original point of death, and Blood Sight [SG, p125] is like the magical version of running a DNA test on a blood sample, with some magical possibilities that mundane forensics can't reveal.
Grave Binding [SG, p129] itself isn't very useful for you, as it simply protects corpses from being possessed or inhabited by spirits, but it's a prerequisite for unlocking the others.