I need a long-term ASP/MSSQL devleoper partnership

This starts with an initial project but then grows over time. My initial project requires 1. a developer to come up to speed (all source code is in [login to view URL]) 2. the ability to add some new TRUE/FALSE flags to clients 3. update a current wizard (7 pages) that will use the flags to collect 3 new variables (i.e. if TRUE, then get these 3 variables) 4. change a export routine that if the variables are present, add new items (exports data into MYOB format, etc) This is only the start. I have a development list as long as my arm. The site I am is making money and my business partner/developer is off to do other things. I don't know how to cost this because I'm not a developer. I would strongly prefer a developer in the USA because my experience shows that cheaper alternatives are simply too hard to manage and don't want to understand but want me to tell them EXACTLY what to do.