Whats involved w/ purchasing residential lot & convert to comm?

[Rick McGeeney]

What are the pros & cons to purchasing a residential lot (vacant land) and converting to commercial zoning (commercial properties all around)?  What's involved?  What's the cost involved?  

Also, they say no sewer is available for this property.  I'm guessing they mean no public sewer service, but I should be able to install septic service, correct???  What would be the expected costs involved to put septic system in?  Thanks in advance!