Your car should come up with an inspection message on the cluster. I'm not sure if it tells you inspection 1 or 2. but it won't hurt to start with a 2 as it covers all the same stuff as 1 and then next time just do a inspection 1.
the inspection too will give you a good idea of whats been done already depending on how things look.
as for the intervels I don't know off the top of my head and I'm at work so I'm not sure but someone around here should know.
2008 128i Jetblack