The new monetary currency  is divided as follows:

bills of 5, 10, 20, 50, 100, 200, 500;

 and coins of cents:

  1, 2, 5, 10, 20, 50,

 1 Euro and     2 Euro

Various security features have been incorporated into the euro banknotes. They will help you to recognize a genuine banknote at a glance.

Feel the "raised" print – special printing processes give banknotes their unique feel.

Look at the banknote and hold it against the light: the watermark, the security thread and the see-through register will then be visible. All three features can be seen from the front and the reverse side of genuine banknotes.

Tilt the banknote: on the front, you can see the shifting image on the hologram stripe (on the €5, €10 and €20 banknotes) or on the hologram patch (on the €50, €100, €200 and €500 banknotes). On the reverse side, if you tilt the banknote, you can see the glossy stripe (on the €5, €10 and €20 banknotes) or the color-shifting ink (on the €50, €100, €200 and €500 banknotes

Tourists reaching Italy without foreign currency can obtain Euros through any bank, ATM machine, or exchange office (Ufficio di Cambio), at airports, seaports and railway stations in the main cities. Foreign notes, travelers’ checks  are purchased by Italian banks at the current rate of exchange less a commission, but normally they apply a minimum fee of 10 Euros regardless the amount and the rest .
The easiest method of securing cash at the best exchange rate is to make withdrawals using a US credit card from the ATM machines found at the major banks and stores.