If you want to keep it easy, you don't need to bother with opening accounts with futures brokers, you can simply open an account with Oanda.
http://fxtrade.oanda.com/forex_tradi...easuries.shtml
Yes, they're a forex broker, and due to some bad apples in the bucket their industry has got a bad reputation, but Oanda is the largest, and I think, trustworthy. They've recently got a USD 100 Million venture capital investment (
http://www.accessmylibrary.com/coms2...6-32894573_ITM).