Yes, you cannot create a new codeplug file without reading the radio first. Read the radio then you will be able to view the radio feature settings, channels, zone/banks, etc. and make the necessary changes.
Also, you should decode the radio flashcode that is on the radio data label or view the feature sets listed under the Radio Information tab in the CPS so you know what features the radio has or do not have, such as digital or analog only mode and other features. If you're going to use the radio for conventional personalities then you should not care if you have the smartnet or smartzone Trunking feature(s), and if you're going to use the radio for GMRS only then you shouldn't need the P25 Astro Digital capability.
The 4th character in the model number will tell you the operating band. "K" - 138-174 MHz, "Q" - 380-470 MHz, "S" - 450-512 MHz, "U" -700/800 MHz, and "W" - 900 MHz