The best way to begin is to select the volume on the flashdrive that is appropriate to your child's age. The approximate age ranges of each of the nine volumes are clearly indicated on the flashdrive. Before browsing through the other contents of the volume you select be sure to read the diary included on that volume. This will ensure you find all the relevant material. Obviously children are all different and your child may need more or less advanced material in various areas. You can easily make this adjustment by looking at earlier or later volumes.
Of course you may have already settled into books or materials in some or all subject areas and only wish to use the Mothers' Companion for one or two subjects. Browsing the relevant volumes will help you find all sorts of gems that will save you time, Again, don't forget to look at the diaries as they will point you to resources on the flashdrive you may have overlooked.