Tomasek surname

Hi I am just beginning research on the Tomasek surname. My Grandmother Anna (Cada) immigrated to the Bellaire Ohio area with son James (Vaclav). They were from Plzen. Her husband Frank Tomasek arrived about a year later. I believe this was early 1900’s. I believe the ship arrived in Baltimore. They had two more children – Helen and Frank. I am looking to find any info on family history in Plzen. Thank you