Helping start-up companies setup a home office

The focus of my home-based business is on bookkeeping and accounting. We would like to expand our services to help other home-based businesses setup their accounting systems.

The aim will be on fairly basic users. And I plan to offer the following services:
Computer setup
Printer Setup
Internet and router setup
Accounting software installation
Firewall and anti-virus installation
Desktop and keyboard shortcuts

Are there other factors that I should consider?
Is there something else that I should learn about?
Would you recommend I take a course in a certain field? Maybe obtain a Microsoft certification?