|Certainly you'd have to rent, or lease, your connection from a provider. What type would probably depend on how much business you had and expected in the future.|
If it were me, I'd go with fibre optic from a provider able to bring a cable with multiple fibre optic lines inside it (12, 24, etc) so you could add more connections (bandwidth) should your business take off and end up requiring more bandwidth than you start with.
However, the only people who can tell you what different types of services they have available and how much it would cost would be the providers so I recommend you start phoning them.
Even if someone who hangs out in here worked at a provider (I don't believe any of the regulars do) you'd only get one quote so it's worth your time to phone around if you're really serious.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.