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Try selling yourself for a while, it'll let you understand your customers better and will also make it much easier to hire sales people when the time comes.

For initial sales the easiest approach is to pitch to people you know who work at companies that might be interested in your product and convince them to act as an intermediately in getting you a meeting with the person who can make the buying decision.

I'd also recommend reading "Crossing the chasm" as it'll help you decide who the best companies to target initially are.

If your product is one that sells itself (i.e. it solves an obvious problem, clearly enhances revenues or reduces cost) then cold-calling might well work as well. Use networks like LinkedIn to find the appropriate people to pitch to and just send them an email or give them a call.