for operating a high power walkie talkie, you need government approval....I don't remember if from PTA or police or something.. And you need to get a frequency approved or licensed or something....the government owns the air. any radio waves through the government's air needs their approval.
Unless its in the ISM band, then anything less than some specified range(which I forgot) is okay...
So in short the practical walkie talkie that you are looking for is not available to general public, unless they are in security, industry (like construction) etc, and even then you need approval before using.
And most importantly, this is just a toy bro, so take it easy...