Look through family records for other data. Note the location of birth, death, or marriage - this comes in handy later if you have to access parish or government records. Send a questionnaire to other family members. Use sites such as Ancestry Com or Family Trees to further trace. It will also allow you to share your data with other researchers in standard formats.
Nothing is more annoying than to lose a vital contact address in a flood of unlabelled notes.
The primary geographical area of my interest is the villages of Reichelsheim and neighboring Hiltersklingen in Hesse, Germany. These villages are about half way between Darmstadt and Heidelberg. As I understand it, early Treusch's owed allegiance to the Duke of Erbach, and bought their land, or holdings, from him. There is a castle there, and the town of Erbach can also be readily found near Reichelsheim. There are many towns of the same name throughout Germany.