Hi Bill
Welcome to RootsChat
Hopefully someone may recognise your family lines and be able provide further info. In the absence of that, there are a number of things that you can do to further your research.
From what I can see of your tree on Ancestry you have:
1. James Wood m. Elizabeth ? = James Wood born c. 1901
} James Wood married m. Margaret Thomson date ?
2. ? Thomson m. ? = Margaret Jane Thomson born c. 1905
3. John Webster m. ? Cow = John Webster born ?
}John Webster married Annie Mary Walker date ?
4. James Walker m. Isabella Cow (born c. 1879) = Annie Mary Walker born c. 1906
It would make good sense for you to start with the latest marriages that you have and confirm details before moving back to the next generation. Scotlands People is the official pay to view site for BMDs and census images. Scottish certificates as I am sure you know are very informative and, for marriages, will include full details of the bride and groom's parents including mother's maiden name and father's occupation and whether they were alive or deceased at the time of their marriage. With this information, you can then search for their parents' marriages and move on to the censuses for further background and information.
I am not seeing a marriage between a James Wood and a Margaret Thomson in Banff between 1915-1933 (the cut off date for marriages on line at SP (Scotlands People) but there are two entries showing elsewhere in Scotland.
For John Wood and Annie Mary Walker there is a marriage showing in 1928 in Aberdeenshire which is likely to be theirs (the only one showing for a John Walker and an Ann* Walker (actually indexed as Annie Mary
up to 1933.
Once you confirm full details on their parents (and their parents' marriages) we can all help with looking for them on the censuses. The further back you go, the easier it can become to find information on line in many cases.
There are a couple of helpful guides here on RC:
www.rootschat.com/forum/index.php/topic,24468.0.html - researching in Scotland
www.rootschat.com/forum/index.php/topic,43916.0.html - getting the best out of Scotlands People
Monica