Need Help from Greco-Roman specialists…

I am doing some research on the history, habits, strategies, ethos, and organization of the Roman Army from its inception to the the end of the first century AD.  I can find books on the Roman army relatively well (though suggestions of highly respected authors and sources are welcome!).  I need to get to know the most respected journals in which to look.  Who can help me out?  What online resources are there for searching journals of classics and ancient Roman history and society?  I am pretty new to the Greco-Roman world research, so feel free to ‘dumb-it-down’ for me 🙂

Thanks

NB: Some of the fruits of this research will be presented at the Tyndale Fellowship conference in July, so I can thank you in person if you are in attendence – please let me know if you are going!