Nice period, Kenny - with a good egg on the throne - the short reign of Titus. However, things fell apart somewhat when their Domitian came to power in 81.
Bookwyrme has given you a good suggestion with the Boyle and Dominik, it will give you a nice overall picture. But there's nothing like primary sources, so don't omit Suetonius' Lives of Titus and Domitian, for a bit of scurrilous bio. Amazon will have Suetonius in Penguin Classics at a snip. It will also give you a flavour of the politics operating. If your library has a copy of the Cambridge Ancient History Volume XI - The Imperial Peace - this will also give you a cracking overall picture, with sections on social history, politics, religion, provincial government - the lot. You may even be able to get an old second hand one somewhere - they are far too expensive to buy at over £100 a volume, alas, unless you were doing a serious study of the period.
For food and other sumptuaries - I can recommend
Empire of the Pleasures by my very good friend Dr. Andrew Dalby (Amazon) together with
The Classical Cookbook written by Andrew with Sally Grainger (again, Amazon will have a copy, either new or through the Market Place).
You might also like to try reading one or two of Lindsey Davis' Falco novels, to see how another author handles the reconstruction of Rome in exactly the period you're after, especially if your characters are going to be ordinary types, who don't live in big houses
Alas, I can't give you any real help with soldiers beyond the basics - I don't do soldiers in any great depth, as I find men waving swords tedious, but I'm sure others will point you in the right direction here. There are whole rain forests dedicated to the Roman Army
Some old stalwarts never fail - you can pick up quite cheap copies these days of 'Life and Leisure in Ancient Rome' by J.V.P.D. Balsdon. My own copy of this from the 70s was worn out in hardback, and I found a nice new paperback at under £5. There'll be stuff to get you started there, even though the book deals with a wider period than you are focusing on.
Don't forget to look at art and sculpture of the period for a bit more flavour - you'd be amazed what can be gleaned from this. And don't neglect coins. In fact, it's probably best to submerge yourself in the period and its history and
mores for a while as you prepare your notes, before you even begin to write your first chapter. It will save you a lot of heartache later.
Happy hunting, Kenny.