If you are planning a one man operation or at most one or two detailers, it's a piece of cake. I am a retired tool eng (tools, dies, jigs, fixtures, special machines-whatever) and working at home specializing in jet engine tooling. I use Acad14.
If you have the necessary software and hardware and are experienced in using it, all you need for control is a financial program such as Quicken. I am going to upgrade to Quicken Pro. Get an accountant and work with him when setting up your accounts. Makes it a lot less stressfull at tax time.
If you plan a larger company a lot more planning and organization is required. I use to manage job shops with up to 275 employees so I know what is required. Walk carefully.
You have to be set up for possible rapid growth.
Al Kirby
askkkf@avci.net