Searching for Scottish Ancestors

You should look for the documented information first such as Birth Certificates, Marriage Certificates, Death Certificates but do not disregard the non documented material like verbal information. You can trust verbal information totally but it can give you some good leads.

Information of a less statistical nature is very useful as try to get a picture of your family history and trace characteristics through the years. Some of these are:

Appearance
Characteristics
Habits
Motives
Old Sayings
Family Legends
Old Photographs
Memorial Cards
Indentures
Birthday Book
School Report
Army Rolls
Family Bible

There are many more so if you stumble on anything that has history related to your family evaluate it.

A good resource for your search is My Ain Folk.