I agree with Walkman. Get a 67 marker y chromosome test from Family Tree DNA (only the y chromosome will allow you to link up with other Robinsons and possibly relatives overseas). When you get your results look at the countries of origin and surnames of your matches. They can give you a good idea of the exact area your ancestors may have originated. Then consider doing SNP testing for "macro family"origins. You find that often several different families of different in a single area share some degree of relatedness, and SNP testing can help define that. Then apply that to your paper genealogy and work from there to link up with your new found relatives. Good luck!
Ancestral Surname: Nobles, possibly kin to Clan MacKintosh.
Genographics: R1b-L1065+ (Scots Modal Haplogroup)