Well, for "getting into" ham radio operating privileges depend on your license class. The current introductory license class is Technician, which gives you voice operating privileges on the 70cm, 2m, and 6m bands, and portions of the 10m band (there are small portions of other bands on which Technician class licenses can operate, but those are generally CW only:
http://www.arrl.org/frequency-allocations).
To operate voice on other bands, such as 20m or 40m, a General class license is required. So, since it's required for one to take and pass the Technician license exam before the General license exam, the basic bands for "getting into" ham radio are generally the 70cm, 2m, and 6m bands. In that regard it's pretty easy to get into ham radio, since all you need to do is pass the (easy) Technician license exam, pick up a 2m (or 70cm) handheld transceiver for $100-$150, and you can operate using local VHF repeaters. To operate with voice on HF frequencies would require passing the slightly harder General license exam, and then you can use most of the 20m and 40m bands