Best practice for backup job

I am trying to wrap my head around the backup types and retention using backup exec 2014. I am backing up some Hyper-V VM's from the host and only want the backups for 3 days. How would I accomplish this?

It seems I'd want a full backup every 3 days but I'm not sure what to do for the incremental or perhaps differentials nor how long to keep each type.

Any other ideas?

Any good reading on really understanding the backup types and retention to accomplish various backups?