I agree with Grant, don't outsource at this stage, at least not the core idea of your business. (e.g. you could outsource development of the marketing website)

The single biggest advantage you have as a startup is speed. Large companies have long decision making processes, need time to align everybody on a new direction, often have heavier planning processes that require some kind of formal sign-off etc. As a startup, you can make quick decisions and change course in a matter of days.

Don't throw that advantage out the window by outsourcing your core development.