Here's a list of sources i have been using for study... It's lots of reading but if you have specific questions about a particular source i will try and help.
Titus Livius – History of Rome (Also on gutenburg.org – search ‘Livy’. Note: massive lacunae in the Caesar section reduces the usefulness of this source)
Adrian Goldsworthy – Caesar: Life of a Colossus M. Cary – History of Rome H. H. Scullard – Gracchi to Nero Robin Seager – Pompey Christian Meier - Caesar