Dan,

I also think that the Oxford comma is more professional - sure, optional, but more professional, so I suggest placing a couple extra commas on your frontpage as follows:

The East Valley Maintenance Group (EVMG) is ready to tackle your to do list.
Whether you need landscaping, yard maintenance service, or a handyman, inside or out, we are prepared to answer your call for help.
We have merged our businesses and expertise to bring you the best combined service.
Do you need help with your home, a rental property, or corporate space?
We can handle it.