You'd need an appropriate FCC license to do that.
To get a license, you need to file. To file, you need to know what you are asking for.
For your "on the road" use, an itinerant license would be the right thing. You can apply for those easy enough, but the application can be a bit of a challenge for those not familiar with it.
For your dispatch operations, you'll need a coordinated frequency, since it'll be used in a fixed location and you'll want something more than what the itinerant licenses will offer you. You probably want a repeater if you want any decent range. That'll mean working with a frequency coordinator to find an available frequency. That'll cost a few hundred bucks.
And depending on how many radios you have and what your budget is, putting up a repeater can be cost prohibitive unless you have deep pockets. The cost of a decent repeater will be a few thousand. Access to a tower/building/hill to install it at to provide decent coverage can be costly. Antenna, coax, combiner, etc. all will cost several thousand. A competent tech to tune and install it all will cost more.
Often a -much- cheaper approach is to contact a few local radio shops. Many of them can lease you space on their own radio systems. This can save you a LOT of money, because the cost of the repeater and maintenance gets shared amongst a lot more users. They'll take care of the licensing, radio programming, etc.
A good radio shop can help you figure all this out. They can set up your radios to access their repeater/trunked system and set up your dispatch point. They can add "talk around" frequencies for use by your drivers when they are outside the area.
VHF/UHF is something that's determined by your needs and what the frequency coordinator can find. Do NOT purchase radios without going through the frequency coordinator or radio shop, as you may very well get the wrong type of radio.
Talk to a couple of radio shops first. Find out what they offer and what kind of services they have.