I think one skill that every entrepreneur should learn is how to be resourceful and get things done. Even if you don't have many resources, it's possible to start prototyping and creating your first versions of a product. The barrier of entry to most businesses and industries are extremely low these days.

Try to leverage as many open source or off-the-shelf services to get started. Many of these are free or low-cost for smaller scale products.

You can also try to recruit and find others who believe in your mission and goals; many times, this can be done for equity (without cash).