For a level 1 job, the only way to get there is to walk.
If you're in San d'Oria, the route is East Ronfaure > La Thiene Plateau > Jugner Forest > Batallia Downs > Upper Jeuno.
Bastok > South Gustaberg > North Gustaberg > Konschtat Highlands > Pashhow Marshlands > Rolanberry Fields > Lower Jeuno
Windurst > East Sarutabaruta > Tahrongi Canyon > Meriphitaud Mountains > Sauromugue Champaign > Port Jeuno
Here are some maps:
www.ffxi-atlas.com. It's a pretty long walk. Probably over an hour if you're going full tilt. The hardest part for a level 1 character is going to be avoiding all the high level aggressive monsters on the way that could probably take you out in one hit, especially since you don't have much experience in the game and don't know what their range of seeing and hearing is.