Billiybuds,
Two typical rosters from the bottom of the 747 are like this:
1/2 off, 3-7 s Africa, 8 off, 9-11 E USA, 12-16 off, 17-19 E USA, 20/21 off, 22-24 mid east, 25-27 W USA, 28-30 off.
1/2 carry in trip, 3/4 off, 5-7 E USA, 8-10 off, 11-13 Africa, 14/15 off, 16-18 mid east, 19/20 off, 21-23 E Canada, 24/25 off, 26-28 Africa, 29/30 off.
The most junior FO on the fleet will be about 500 places above you on the seniority list. So you will be at the bottom for a log while.
Hope this is of use
Regards