Recommendation #1: Don't restrict your research to the Internet.
The Protestant church records for Sippersfeld from 1702 to 1957 have been microfilmed by the Family History Library. You should easily be able to find several generations of ancestors in those records. FHL microfilms are available for rental and viewing at any Family History Center. Check with a Mormon church for the nearest FHC to you.

Recommendation #2: Identify what it is you want to know.
It's unclear from you post what exactly you're trying to find out. Finding ancestors and following descendants of collaterals involve different strategies and tactics, as well as research in different records and countries. Prioritize what you want to find out. Then conduct one thread of research at a time.