Please help! Draft registration and Hamburg passanger lists 1850-1934

So my great great grandfather Pawel Tatarewicz run away from his family and I know nothing about him, but I got a hint on ancestry that I can't acces because I can't afford premium, so I looked in family search and found this draft registration. ( https://www.familysearch.org/ark:/61903/3:1:33S7-L1X3-CLS?i=2382&cc=1968530 ) So could someone tell me if I understand it correctly so that he served 4 years in Russian cavalary or what, and also if I can acces the passanger lists somewhere wihout paying? (Sorry for any mistakes english is not my first language and I am really excited about this finding)