You already have your business license, so you could add services offered under that license if you choose to do so: 
-- Installation of Solar PV equipment (racking included) is required to be done by licensed electricians:
-- Residential work may be done by an 02 Journeyman (each 02 may oversee two apprentices on residential work)
-- Commercial work may be done by an 01 Journeyman (each 01 may oversee one apprentice on commercial work)
-- An 01 Journeyman is qualified as an 02 as well

Unless you partner with an electrician it will take at least 4 years to earn either an 01 or 02 Journeyman's card. 

We recommend talking with Electrical Supply Houses and Solar Supply Houses for learning about product options and availability. Solar specific businesses will be glad to talk about products, logistics etc.

One other note I think is important, and please don't take this the wrong way. I have talked with some roofing companies and have known of a few solar installers that are inappropriately using the Federal Tax Credit to help cover the roofing costs when a new roof is added along with a solar pv system. This happens nationally and according to the IRS and the language used in the writing of this Investment Tax Credit, the cost of the roof is not allowed to be part of the credit. I am noting this just in case you have been mis-informed, and I want to make sure you are able to protect your business.