HyTek and Lynx are the most common. If you can gain some experience running the systems by volunteering with a timing company, that is really valuable. The equipment and software really isn't that hard but like many things in life there are the peculiar details that you learn only by doing it for dozens of meets.
Have a good business plan, start with small meets where if you screw up results, it's not a big deal. Look at road races as an easy way to supplement your income outside of T&F and XC seasons. Make sure you have a few employees / partners who love the sport and will become your core crew. You can't do it alone and your crew will make or break you.
Good luck!