The basic test which I recommend is the 37 marker ydna test. You are a male, I hope?? It follows the male line back. Cost is about $150, unless you get a special offer. That happens a couple of times a year and they offer it for $119. That ended in early January though.
Go to: dalrympledna.com to get the purpose of the study. It will direct you to the main website where you can order a kit. It is a simple procedure - a couple of wooden paddle scrapes on the inside of the cheek. No blood.
If I can help you at all, write to me at: firstname.lastname@example.org
. I am a Dalrymple descendent too and know quite a bit about the family history.
Would love to have you join the study.