What to offer my first salesperson?

I’m a single-founder startup producing specialized risk software for financial institutions. The company is based outside the US but that’s where a large part of the potential market lies, so I’m looking at engaging with a US-based sales-person whom I already know and has in-depth knowledge of the market (and a lot of contacts). The software solves a major industry problem at a fraction of the cost and business risk of existing solutions. Question: What’s an appropriate package to offer the salesperson? I’m willing to consider part-time working, a salary/vested equity mix, percentage of royalties, and so on. Most potential clients are on the east or west coasts, so there’d be a fair amount of travel costs to factor in as well.