Best place to start reading

[Kogwar]

So I have been a big fan of Roman history for a long time, but now I want to start really getting serious about researching/learning about Rome, which is part of the reason I joined this forum. So mainly I was wondering if you guys could point me to some good books to get to help me learn more about the Republic and early Empire of Rome, mainly the military, from what I have been seeing Plutarch seems like a good primary source to read.