1. Heavy metals first.
2. It's hard to say and I am no expert. I can say that although the M+L protocol killed things off in sequence it wasn't powerful enough to kill all the creatures in each class and session when Rifing for the recommended time periods. Progressing through the sets didn’t cause me any harm. So maybe in some cases, you can go direct. We are recommended to put our scan results into them and L sets. The scans pick up bigger things than those in the earlier sets. So the golden rule isn't used even in the M+L protocol and we start Rifing our scans (big parasites) from the get-go. So I can’t say for sure, and you have to make up your own mind.
For more details, please check the link: