Not strictly an observing tip, but:
Familiarise yourself with the
StelleDoppie website. It basically presents the WDS and other double star catalogs as a searchable database. I find it very useful for looking up present and future separation of doubles (
Alpha Cen for example is just going through a minimum in separation) and for creating observing lists. It has an extensive advanced search function that lets you find doubles by a long list of criteria.
For making observing lists I often use searches like "constellation Cetus, magnitude of secondary component mag9 or brighter, separation between 0.5 and 30 arc seconds". Search results can be saved as lists in Sky Safari, CdC or CSV format.