Ukrainian currency is Grivnya (GRN). It is currently peged to Euro where 1 EUR = 10.60 GRN and Dollar where 1 USD = 7.60 GRN
You can change money at any bank or just on the streets in small currency exchanges. Take euro or usd as they have the best rates.
Attention! Do not change currency at the foreign people!
Traveler cheques are usualy not accepted.
Visa and Mastercard are the most popular and are accepted almost everywhere in major cities. ATMs are available everywhere throughout the country, so you should never run out of cash :)
It depends on a place. The most expencive is Kiev. Some sample fares (in Charkow):
Bottle of beer: 2-3GRN
Coke 0.5l: 2.5GRN
To be continued..