Good question, Monica, and welcome to WikiTree. First, may I suggest to edit your question and add in the "tags" section Scotland since it appears this will involve Scottish ancestors which will mean working with particular sets of records.
My second suggestion is to do this one step (one generation) at a time and not to progress further back until you have primary source documentation at each step. There are so many fictional Scottish ancestries found both in print and on the internet (including in WikiTree though we strive to correct them).
Records that may or may not be available will change by location and person. My suggestion is to start and post questions here in G2G when you need to and to first join the Scotland Project (the project page has links to sources and specialized help teams). If you ever have questions about the validity of a source, the first thing to do is review the criteria you worked on to get your pre-1700 certification. Then, as needed, reach out to the Scotland project for additional assistance.